feat(web): in-browser debug companion — issue #16 (v0.15.0)

Browser-based debug companion to the Ratatoskr TUI, reusing the existing wire-layer modules unchanged. Same five surfaces (transcript, thinking, tools, debug, persona) over the same Worldtree Conversation API SSE wire, viewable from any device on the operator's LAN. Per docs/contracts/issues/16.contract.md (full v2.1 module contract with 11 FN blocks + 9 invariants + Heid panel review pass merged). Architecture: - New module `ratatoskr.web` with `server.py` (Starlette app, ~250 LOC), `entrypoint.py` (lazy-import gate, ~100 LOC), `static/index.html` (single-page vanilla JS UI, ~360 LOC) - Optional-deps group `[web]` = starlette + uvicorn[standard]; dev pulls these in transitively - New console script `ratatoskr-web` - Streaming via browser-native `EventSource` GET; prompt-submit is a separate POST (load-bearing Hulda finding from R13 panel — EventSource is GET-only) - Small in-memory turn registry maps (session_id, turn_id) → upstream request handle for cancel + browser-disconnect cleanup Endpoint surface (9 routes): - `GET /` → static index.html - `GET /static/*` → static assets - `GET /version` → {"ratatoskr": "<version>"} - `GET /api/agents` → upstream /agents + local Tier 3 merge - `POST /api/sessions` → upstream POST /sessions - `GET /api/agents/{id}/persona_state` → upstream persona-state - `POST /api/turns/{sid}` → allocate turn_id, register in turn registry - `GET /api/turns/{sid}/stream?turn_id=N` → proxy upstream SSE to browser - `POST /api/turns/{sid}/cancel?turn_id=N` → upstream cancel Trust model: internal LAN debug surface. Binds 0.0.0.0:8765 default; no auth, no CORS guard (operator direction). What stays disciplined regardless of network trust: - Transcript HTML-escapes assistant content (INV-004 — model output is untrusted text; adversarial HTML must not execute in browser) - Upstream API key never reaches browser DOM (INV-003 — proxy-only) Lifecycle: - Browser disconnect mid-stream → upstream cancel (INV-005; asyncio.CancelledError caught in stream handler) - Server Ctrl-C → lifespan shutdown drains turn registry within 5s budget (INV-006; structured-log line on timeout) Tests (37 new, 356 total; previous 319 baseline preserved): - tests/test_web_server.py (23 cases): endpoint contract via Starlette TestClient + respx mocks; covers each endpoint, browser-disconnect → upstream cancel, lifespan shutdown draining the registry - tests/test_web_presentation_contract.py (11 cases): proxy serialization matches tests/fixtures/presentation_contract.json for one of each Event type — drift detection between server-side serializer and the JS presenter without forcing a shared abstraction - tests/test_web_packaging.py (4 cases): static asset packaging via importlib.resources; AST-checked lazy-import discipline (no top- level starlette/uvicorn import in entrypoint.py); missing-API-key exit-11 path; missing-extras exit-12 path Provenance: - Scope v1 → Heid panel review (Gróa + Hulda, R13) → 8 load-bearing corrections (POST→GET split, Starlette > FastAPI, lazy-import discipline, browser-disconnect → upstream cancel, presentation- contract fixture, error event contract, static-asset packaging, escaped plain-text Markdown deferred) merged into scope v2 - Operator direction: internal-LAN debug surface; auth + CORS deliberately omitted Not yet (deferred to v0.16.x+): - Cross-reload session resume via Last-Event-ID - Tier 3 lifecycle UI (define/patch/delete in browser) - Markdown rendering with vendored safe-subset renderer - TLS + real auth (only if a non-LAN use case ever surfaces)
fix(tui): disable RichLog min_width floor so wrap actually applies (v0.14.2)
2026-05-27 19:03:50 -07:00 · 2026-05-27 12:25:16 -07:00 · 2026-05-27 00:25:47 -07:00 · 2026-05-25 22:57:33 -07:00 · 2026-05-25 19:13:47 -07:00 · 2026-05-25 18:55:12 -07:00
27 changed files with 5098 additions and 340 deletions
@@ -7,11 +7,19 @@ documents the pin, the vendored artifacts, and the bump procedure.

 | Field | Value |
 |---|---|
-| Worldtree git SHA | `55101e909abcd2219833266b6f905c5bc956e0f0` |
-| Worldtree HEAD message | `memory: snapshot — #177 Vili v1 + persona async-decouple shipped as v0.19.0` |
-| Pinned on | 2026-05-20 |
-| Pinned by | brokkr-smithy-dev (initial scaffold) |
-| Worldtree version at pin | `v0.19.0` |
+| Worldtree git SHA | `562001af28d752c3a60d449c7ddd09f44fa9dc9a` |
+| Worldtree HEAD message | `feat(#201): v0.29.0 — awaiting_llm_first_token SSE heartbeat` |
+| Pinned on | 2026-05-26 |
+| Pinned by | ratatoskr-dev (bump for #201 awaiting_llm_first_token SSE) |
+| Worldtree version at pin | `v0.29.0` |
+
+## Pin history
+
+| Date | SHA | Version | Notable deltas consumed |
+|---|---|---|---|
+| 2026-05-26 | `562001a` | v0.29.0 | #201 — new SSE event `awaiting_llm_first_token` (heartbeat during BuildingPrompt → CallingLLM gap, default 5s interval) |
+| 2026-05-25 | `da93ca7` | v0.28.0 | #204 — new SSE event `affect_update` (current/scheduled), new endpoint `GET /agents/{id}/persona_state`, auth-model doc edits |
+| 2026-05-20 | `55101e9` | v0.19.0 | initial scaffold pin |

 ## Vendored artifacts

@@ -161,7 +161,7 @@ New `Static(id="pane-name")` widget alongside the existing `identity` + `hint` w
 - **INV-019** *(amended v0.6.0)*: Three TabPanes in the right column: `Tools` (id `tools-tab`, contains `#tools-log`) + `Debug` (id `debug-tab`, contains `#debug-log`) + `Thinking` (id `thinking-tab`, contains `#thinking-log`). Ctrl+1/Ctrl+2/Ctrl+3 activate respective tabs. `pane-name` Static reflects active tab name dynamically.
 - **INV-020** *(amended v0.6.0)*: Render-exception fallback (INV-009) preserves routing per event class: `ToolStart` / `ToolResult` → `tools_log`; `Thinking` → `thinking_log`; `WorkerPhase` / `TextBoundary` → `debug_log`; everything else → `log`.
 - **INV-021** *(new v0.6.0)*: `Text` events do NOT route to `log` per-delta. They accumulate into `TuiPresenterState.text_buffer` and update a single `current_text` Static (docked above the prompt). On terminal event (`Done`/`Error`/`Cancelled`), `current_text` is cleared and (raw mode) accumulated text or (non-raw) post-Done `Markdown(response)` is written to `log`. The pre-v0.6.0 per-token RichLog spam is retired.
- **INV-022** *(amended v0.6.5)*: Thinking deltas stream DIRECTLY into `thinking_log` (one delta = one RichLog line). The first delta of a run writes `Rule(title=f"turn N · thinking #K start")`; subsequent deltas write their raw content as lines; the run closes on the next non-thinking event with `Rule(title=f"turn N · thinking #K end")`. Pre-v0.6.5 markdown re-render dropped — the streamed deltas ARE the content; the whole pane scrolls naturally as content arrives.
+- **INV-022** *(amended v0.7.1)*: Thinking deltas COALESCE on `\n` boundaries before writing to `thinking_log`. The first delta of a run writes `Rule(title=f"turn N · thinking #K start")`; subsequent deltas accumulate in `TuiPresenterState.thinking_chunk_buffer`; whenever the buffer contains `\n`, the leading line(s) flush as RichLog entries (one entry per natural paragraph). The run closes on the next non-thinking event: any tail in the buffer flushes as a final line, then `Rule(title=f"turn N · thinking #K end")`. Pre-v0.7.1 per-delta-per-line caused token-spam (Worldtree emits thinking at token granularity); coalescing produces one log line per natural paragraph, not per token.
 - **INV-023** *(new v0.6.0)*: Turn-ID header `Rule(title=f"turn N")` is written to all four log panes (`log`, `tools_log`, `debug_log`, `thinking_log`) by `_stream_turn_worker` on the first event of each turn — enables cross-pane visual correlation during multi-turn debugging.
 - **INV-024** *(amended v0.6.5)*: `thinking-current` Static REMOVED. v0.6.1 placed it inside the Thinking pane (docked bottom); operators reported the bottom-docked Static "scrolling a little section at the bottom" (its 200-char tail acting as a scroll-window) instead of letting the whole pane scroll. v0.6.5 deletes the Static entirely and streams Thinking deltas directly into `thinking_log` (the scrollable RichLog) — the whole pane scrolls naturally as content arrives. The Rule(start) at the first delta of a run is now the live "thinking is happening" indicator.

@@ -0,0 +1,364 @@
+---
+contract_version: "2.1"
+issue: 16
+target_module: "ratatoskr.web"
+scope: "New module `ratatoskr.web` exposing a browser-based debug companion to the Ratatoskr TUI. Reuses `ratatoskr.sse_client`, `ratatoskr.sessions`, `ratatoskr.tier3`, `ratatoskr.local_agents`, `ratatoskr.cli` unchanged. Adds a Starlette web server (`ratatoskr.web.server`), a lazy-import console-script entrypoint (`ratatoskr.web.entrypoint`), and a single-page static UI at `ratatoskr/web/static/index.html`. Optional-deps group `[web]` carries `starlette>=0.40` and `uvicorn[standard]>=0.30`. Surface: 9 HTTP endpoints (1 root, 1 static, 1 version, 5 API proxies, 1 SSE stream). Bound to `0.0.0.0` by default for LAN consumption — internal-LAN debug surface, no auth, no CORS guard (deliberate operator direction). The five Worldtree SSE surfaces (transcript, thinking, tools, debug, persona) render in the browser via the same routing rules as the TUI, with client-side JS re-implementing the presentation discipline (no shared abstraction extracted at v0.15.0). Goal: operators have a sharable / inspectable second viewport on the same Worldtree SSE stream, reachable from any device on the LAN."
+depends_on:
+  - "ratatoskr.sse_client"
+  - "ratatoskr.sessions"
+  - "ratatoskr.tier3"
+  - "ratatoskr.local_agents"
+  - "ratatoskr.cli"
+  - "starlette"
+  - "uvicorn"
+  - "httpx"
+used_by: []
+language: "python"
+complexity: "medium"
+estimated_loc: 600
+confidence: 0.85
+assumptions:
+  - "**Browser-native EventSource is GET-only.** The SSE stream endpoint is `GET /api/turns/{sid}/stream?turn_id=<id>`; the prompt-submit is a separate `POST /api/turns/{sid}` that returns `{turn_id}`. The two calls share a small in-memory turn registry keyed on `(session_id, turn_id)` so the cancel and disconnect-cleanup paths can find the in-flight upstream request. This split is a load-bearing correction from the Heid panel review (Hulda) on scope v1."
+  - "**Trust model is internal LAN.** Binds `0.0.0.0:8765` by default; `--host 127.0.0.1` available for localhost-only. No auth, no TLS, no CORS guard. The operator has explicitly accepted this: anyone routable to the host's port can reach the interface. What stays disciplined regardless of network trust: (1) transcript HTML-escapes assistant content (model output is untrusted text — adversarial HTML in responses must not execute in the browser); (2) upstream API key never reaches the browser DOM or any client-visible response field."
+  - "**Optional-deps lazy-import discipline.** `ratatoskr.web` deps (`starlette`, `uvicorn`) are an optional-extras group `[web]`. The console-script entrypoint `ratatoskr.web.entrypoint:main` parses CLI flags BEFORE importing `ratatoskr.web.server` so users without the extras installed get a clean `pip install ratatoskr[web]` message instead of a naked `ImportError: starlette`. Both Heid panel arms (Gróa + Hulda) converged on this. `ratatoskr.web.__init__` is bare; no module-level imports of starlette/uvicorn anywhere on the cli import path."
+  - "**Starlette over FastAPI.** Both Heid panel arms converged: five thin proxy endpoints don't need FastAPI's Pydantic / OpenAPI / dependency-injection machinery. Use Starlette + manual `Response` / `StreamingResponse` / `JSONResponse` construction."
+  - "**Static asset packaging.** `src/ratatoskr/web/static/index.html` ships in the wheel via `[tool.hatch.build.targets.wheel]` include rules. Located at runtime via `importlib.resources.files('ratatoskr.web') / 'static' / 'index.html'`. Test asserts this resolution works in the installed package."
+  - "**Presentation contract pinning.** A JSON fixture at `tests/fixtures/presentation_contract.json` enumerates the expected browser-facing event payload for each Event type (one entry each for WorkerPhase, Thinking, Text, TextBoundary, ToolStart, ToolResult, Done, Error, Cancelled, AffectUpdate, AwaitingLlmFirstToken). Server-side proxy serialization is unit-tested against this fixture. JS-side rendering treats the fixture as the contract. Drift detection between TUI and JS presenter without forcing a shared abstraction (Hulda)."
+  - "**Browser-disconnect → upstream cancel.** When the browser closes the EventSource (tab close, navigation, explicit disconnect), the server's stream handler catches the `asyncio.CancelledError` raised by Starlette's BackgroundTask cleanup and triggers an upstream cancel on the matching `(session_id, turn_id)` via `ratatoskr.sse_client.cancel_turn`. Both Heid arms convergent. Test simulates the disconnect via `respx` + `httpx.AsyncClient` test-client and verifies the upstream cancel call lands."
+  - "**Mid-stream Ctrl-C safety.** Server uses Starlette's `lifespan` shutdown hook to issue upstream cancels for every entry in the turn registry within a 5-second cleanup budget. Entries that don't ack in time are abandoned (structured-logged). No half-written state on the Worldtree side under cooperative cleanup."
+  - "**Markdown rendering is escape-first.** v0.15.0 ships HTML-escaped plain-text rendering for the transcript pane only. Markdown rendering with a vendored safe-subset renderer is deferred to v0.16.x. This is a deliberate first-cut safety call (Hulda) — hand-rolled Markdown is easy to get wrong around HTML escaping when model output is untrusted."
+  - "**Server-side structured JSON logging.** One JSON line per HTTP request (method/path/status/duration_ms/client) + one line per SSE open/close (with events_forwarded + reason). Lets the operator diagnose problems when the browser viewport is the only one running (Gróa)."
+  - "**Per-pane copy + version footer affordances.** Each pane (Tools / Debug / Thinking / Persona) has a copy button that surfaces the pane's plain-text content for paste-into-issue / paste-into-bug-report flows. Footer carries the running `ratatoskr` package version for version-correlation when comparing browser to TUI (both Gróa-flagged)."
+  - "**Resume punted at v0.15.0.** No cross-reload session resume via `Last-Event-ID`; reload starts fresh. `/api/sessions` (GET) endpoint dropped from v0.15.0 — only `POST /api/sessions` (create) is shipped. Resume moves to v0.16.x."
+  - "**Tier 3 lifecycle stays CLI-only.** The web UI is read-only for Tier 3 surface — define / patch / delete remain in the `ratatoskr.tier3` CLI. Web surface lists Tier 3 agents (via the same `local_agents.json` merge that the TUI does) but doesn't expose mutation. Mutation UI deferred to v0.16.x."
+  - "**Tests use Starlette's TestClient + respx for upstream.** Same `respx` pattern as `tests/test_sse_client.py` / `tests/test_sessions.py`. New test files: `tests/test_web_server.py`, `tests/test_web_presentation_contract.py`, `tests/test_web_packaging.py`. No live network; the live smoke-test is part of the post-merge ship verification, not the unit tests."
+open_questions:
+  - "Should `--open` auto-open default to True or False? Draft: False — the LAN use case often runs the server on one device and connects from another, so auto-opening on the host is wrong by default. Operator passes `--open` when running locally and wants the convenience."
+  - "Should the turn registry's cleanup-budget timeout (5s) be CLI-configurable? Draft: no for v0.15.0 — 5s is a reasonable default and adding a flag invites bikeshedding. Revisit if real outage telemetry suggests otherwise."
+  - "Should the static `index.html` carry a build-time hash for browser cache-busting? Draft: no for v0.15.0 — the use case is short-lived debug sessions; operators reload manually. Vendored renderer + Markdown rendering in v0.16.x is the right time to introduce cache-busting if needed."
+prd:
+  issue: 16
+  issue_url: https://gitea.phasefinal.com/vh/ratatoskr/issues/16
+  body_sha256_16: "ae32cee38fd35761"
+  lock_in_comment_id: null
+  lock_in_sha256_16: null
+  lock_in_at: null
+  pinned_at: "2026-05-28T01:43:24+00:00"
+---
+
+# Web companion — in-browser debug surface
+
+## Context
+
+Ratatoskr is a debug TUI for the Worldtree Conversation API. The wire-layer modules (`sse_client`, `sessions`, `tier3`, `local_agents`) are well-factored and reusable. This issue adds a sibling presentation surface: a browser-based debug companion that consumes the same SSE wire and renders the same five panes (transcript, thinking, tools, debug, persona). Reachable from any device on the operator's LAN — "show someone what I'm seeing" — without replacing the TUI as the canonical debug interface.
+
+The work is wire-layer-zero (no changes to `sse_client` / `sessions` / `tier3` / `local_agents`) plus a new top-level module `ratatoskr.web` with a Starlette app, a console-script entrypoint, and a single-page static UI. Optional dependencies (`starlette`, `uvicorn`) ship as an `[web]` extras group so users who only want the TUI don't pay the install cost.
+
+## Public surface
+
+### Console script
+
+```
+ratatoskr-web [--host HOST] [--port PORT] [--open]
+
+  --host HOST   Bind address. Default: 0.0.0.0 (LAN-accessible).
+                Use 127.0.0.1 to restrict to localhost.
+  --port PORT   Listen port. Default: 8765. Use 0 for random free.
+  --open        Auto-open the URL in the system browser.
+```
+
+### Server endpoint surface
+
+```
+GET   /                                  → serve index.html (200)
+GET   /static/<path>                     → serve static asset (200) or 404
+GET   /version                           → {"ratatoskr": "<version>"}  (200)
+
+GET   /api/agents                        → 200 with [AgentInfo + tier3 local merge]
+POST  /api/sessions                      → 201 with SessionInfo
+GET   /api/agents/{agent_id}/persona_state
+                                         → 200 with PersonaSnapshot, or 404 / 403
+
+POST  /api/turns/{session_id}            → 200 with {"turn_id": <int>}
+GET   /api/turns/{session_id}/stream
+        ?turn_id=<int>                   → 200 SSE stream (text/event-stream)
+POST  /api/turns/{session_id}/cancel
+        ?turn_id=<int>                   → 200 ok / 404 / 409 / 500
+```
+
+### Module shape
+
+```
+src/ratatoskr/web/
+  __init__.py            # bare — no module-level imports of starlette/uvicorn
+  entrypoint.py          # console-script: argparse, lazy import of server
+  server.py              # Starlette app factory + endpoint handlers + turn registry
+  static/
+    index.html           # single-page UI (vanilla HTML/CSS/JS, no build step)
+```
+
+### Public functions
+
+```python
+def create_app(client_factory: Callable[[], httpx.AsyncClient]) -> Starlette: ...
+def main(argv: list[str] | None = None) -> int: ...  # entrypoint.main
+```
+
+`create_app` is the factory — takes a callable that produces a configured `httpx.AsyncClient` (bearer auth, base_url from env, User-Agent set per `ratatoskr.cli.USER_AGENT`) and returns a Starlette app with routes wired. Decoupling via factory keeps tests simple (the test client passes a respx-mocked `AsyncClient`).
+
+`entrypoint.main` is the console-script target — parses flags, builds the client factory from env, calls `create_app`, runs uvicorn. The lazy-import discipline lives here: `import starlette` does NOT happen at module top — it lands inside `main()` after arg parsing, with an `ImportError` catch that prints the `pip install ratatoskr[web]` hint and exits non-zero.
+
+## Invariants
+
+- **INV-001**: `ratatoskr.web.__init__` and `ratatoskr.web.entrypoint` MUST NOT import `starlette` or `uvicorn` at module top. Import is inside `main()` after flag parsing.
+- **INV-002**: `ratatoskr.web.server.create_app` MUST accept a `client_factory` callable. The app MUST NOT construct `httpx.AsyncClient` at module top or in route handlers; it MUST call the factory.
+- **INV-003**: Upstream API key MUST never appear in any browser-visible response. Server proxies upstream calls using the client factory; only the upstream's JSON / SSE payload is forwarded. No header echo.
+- **INV-004**: Transcript content from upstream `text` SSE events MUST be HTML-escaped before reaching the browser DOM (escape on the wire in the SSE proxy serialization OR escape in the JS rendering — both are acceptable; pick one and stick to it).
+- **INV-005**: Browser disconnect mid-stream (`asyncio.CancelledError` in the SSE handler) MUST trigger an upstream cancel on the matching `(session_id, turn_id)` via `sse_client.cancel_turn`. If the turn already completed, the cancel is a best-effort no-op (existing `CancelAlreadyCompleted` exception is swallowed).
+- **INV-006**: Server shutdown (Ctrl-C / SIGTERM) MUST issue upstream cancels for every entry in the turn registry within a 5-second cleanup budget. Entries that don't ack in time are abandoned with a structured log line.
+- **INV-007**: The turn registry MUST be in-process memory only — no persistence, no shared state across server restarts. Process exit drops the registry.
+- **INV-008**: Each SSE event serialized to the browser MUST follow the contract enumerated in `tests/fixtures/presentation_contract.json` — one entry per Event type, with the exact JSON shape the browser presenter renders against.
+- **INV-009**: All wire-layer modules (`sse_client`, `sessions`, `tier3`, `local_agents`) MUST be used unchanged. Any required change to those modules is out of scope for this issue and gets its own ticket.
+
+## Constraints
+
+- **[security]** Upstream API key never reaches the browser. Lives in `WORLDTREE_API_KEY` env, passed to upstream via `Authorization: Bearer …` header in the client factory.
+- **[security]** Model-output text is HTML-escaped in the transcript pane. No script injection from adversarial assistant responses.
+- **[security]** No CORS guard, no auth — internal-LAN debug surface per operator direction.
+- **[testability]** Server is testable via `starlette.testclient.TestClient` + `respx` upstream mocks. No live network in unit tests.
+- **[packaging]** Static asset `index.html` ships in the wheel; resolvable via `importlib.resources` post-install.
+- **[performance]** Server is stateless across browser tabs; one in-memory registry entry per in-flight turn. Cleanup on browser disconnect / server shutdown.
+
+## Tests (overview)
+
+All test files live under `tests/`. New test files added by this issue:
+
+- `tests/test_web_server.py` — endpoint contract tests via TestClient + respx
+- `tests/test_web_presentation_contract.py` — SSE proxy serialization vs fixture
+- `tests/test_web_packaging.py` — static asset resolution + lazy-import discipline
+
+Existing test files remain unchanged.
+
+## Function blocks
+
+```contract
+FN main(argv: list[str] | None) -> int
+BRIEF: Console-script entry point — parses flags, lazy-imports server, runs uvicorn.
+PRE: [PRE-001 hard] argv parsing succeeds -- argparse raises SystemExit on bad args (exit 2)
+PRE: [PRE-002 soft] WORLDTREE_API_KEY env var present -- if missing, exit 11 [auth_error]
+PRE: [PRE-003 hard] starlette + uvicorn importable -- catch ImportError, print install hint, exit 12 [missing_extras]
+POST: [POST-001 side_effect] uvicorn serves until SIGINT/SIGTERM -- blocking call returns on shutdown
+POST: [POST-002 side_effect] boot banner printed to stderr -- URL + connect-instructions visible
+ERRORS:
+  ImportError -> print "Install ratatoskr[web]" hint, return 12
+  KeyError -> print missing-env error, return 11
+STEPS:
+  1. [parse] argparse: --host (default 0.0.0.0), --port (default 8765, 0 = random), --open (default False)
+  2. [validate] read WORLDTREE_API_URL, WORLDTREE_API_KEY, RATATOSKR_END_USER_ID from env
+     IF WORLDTREE_API_KEY missing:
+       - write [auth_error] to stderr, return 11
+  3. [import] try: from ratatoskr.web.server import create_app
+     EXCEPT ImportError:
+       - write "ratatoskr-web requires the [web] extras..." hint to stderr, return 12
+  4. [factory] build client_factory closure capturing url + key + user-agent
+  5. [app] app = create_app(client_factory)
+  6. [banner] print boot banner to stderr (version, host:port, connect URLs)
+  7. [open] IF --open: webbrowser.open(f"http://localhost:{port}/")
+  8. [serve] uvicorn.run(app, host=host, port=port, log_config=None)
+  9. [return] return 0 on clean shutdown
+TESTS:
+  happy_argv [tracer]: argv=["--port", "0"] with env set → returns 0 after serve loop mocked
+  missing_extras [error]: starlette unimportable → stderr has install hint, returns 12
+  missing_api_key [error]: WORLDTREE_API_KEY unset → stderr has [auth_error], returns 11
+  default_host_is_zero [trace]: argv=[] → parsed host == "0.0.0.0"
+  port_zero_supported [trace]: argv=["--port", "0"] → parsed port == 0
+  open_flag_calls_webbrowser [trace]: argv=["--open"] with mocked webbrowser → webbrowser.open called
+  no_open_default [trace]: argv=[] → webbrowser.open not called
+```
+
+```contract
+FN create_app(client_factory: Callable[[], httpx.AsyncClient]) -> Starlette
+BRIEF: Construct the Starlette app — wire routes, register lifespan, build turn registry.
+PRE: [PRE-001 hard] client_factory is callable -- assert callable(client_factory)
+POST: [POST-001 return_value] returns Starlette instance with all routes registered -- inspect app.routes
+POST: [POST-002 state_change] app.state.turn_registry initialized as dict -- app.state.turn_registry == {}
+STEPS:
+  1. [setup] turn_registry: dict[tuple[str, int], TurnHandle] = {}
+  2. [routes] register routes for: /, /static/{path}, /version, /api/agents, /api/sessions,
+     /api/agents/{id}/persona_state, /api/turns/{sid} (POST), /api/turns/{sid}/stream (GET),
+     /api/turns/{sid}/cancel (POST)
+  3. [lifespan] register lifespan handler that drains turn_registry on shutdown
+     within 5s cleanup budget per INV-006
+  4. [state] attach client_factory and turn_registry to app.state
+  5. [return] return Starlette(routes=routes, lifespan=lifespan)
+TESTS:
+  routes_registered [tracer]: factory=mock → app.routes contains all 9 path patterns
+  state_attached [trace]: factory=mock → app.state.turn_registry is empty dict
+  factory_stored [trace]: factory=mock → app.state.client_factory is the same callable
+```
+
+```contract
+FN version_endpoint(request: Request) -> JSONResponse
+BRIEF: Return the ratatoskr package version as JSON.
+POST: [POST-001 return_value] response is JSON {"ratatoskr": <version>} status 200
+STEPS:
+  1. [lookup] version = importlib.metadata.version("ratatoskr")
+  2. [return] JSONResponse({"ratatoskr": version}, status_code=200)
+TESTS:
+  happy [tracer]: GET /version → 200, body == {"ratatoskr": "<current-version>"}
+```
+
+```contract
+FN agents_endpoint(request: Request) -> JSONResponse
+BRIEF: Proxy GET /agents from upstream; merge with local Tier 3 index.
+POST: [POST-001 return_value] 200 with list of agent dicts (upstream + local tier3 merged)
+POST: [POST-002 exception] upstream error → JSONResponse with upstream's error_code envelope
+STEPS:
+  1. [proxy] async with app.state.client_factory() as client: agents = await list_agents(client)
+  2. [local] local = local_agents.load_local_agents()
+  3. [merge] merged = [as_dict(a) for a in agents] + [as_dict(le) for le in local if le.agent_id not in {a.agent_id for a in agents}]
+  4. [return] JSONResponse(merged, status_code=200)
+ERRORS:
+  SessionApiFailed -> JSONResponse({"error_code": "session_api_failed", "status": exc.status}, exc.status)
+  httpx.RequestError -> JSONResponse({"error_code": "network_error", "message": str(exc)}, 502)
+TESTS:
+  happy [tracer]: respx mock /agents 200 → response merges upstream + local index
+  upstream_500 [error]: respx mock 500 → 500 with error_code envelope
+  network_error [error]: respx connection refused → 502 with network_error envelope
+  local_dedup [scenario]: local entry with same agent_id as upstream → no duplicate in merge
+```
+
+```contract
+FN create_session_endpoint(request: Request) -> JSONResponse
+BRIEF: Proxy POST /sessions to upstream.
+PRE: [PRE-001 hard] request body has "agent_id" key -- 400 if missing
+POST: [POST-001 return_value] 201 with SessionInfo on upstream success
+STEPS:
+  1. [parse] body = await request.json(); agent_id = body["agent_id"]; end_user_id = body.get("end_user_id")
+  2. [proxy] async with client_factory() as client: info = await create_session(client, agent_id, end_user_id=end_user_id)
+  3. [return] JSONResponse(as_dict(info), status_code=201)
+ERRORS:
+  AgentNotFound -> JSONResponse({"error_code": "agent_not_found"}, 404)
+  SessionApiFailed -> JSONResponse({"error_code": "session_api_failed", "status": exc.status}, exc.status)
+TESTS:
+  happy [tracer]: respx mock 201 → endpoint returns 201 with session JSON
+  unknown_agent [error]: respx mock 404 → 404 with agent_not_found envelope
+  missing_agent_id [adversarial]: body without agent_id → 400
+```
+
+```contract
+FN persona_state_endpoint(request: Request) -> JSONResponse
+BRIEF: Proxy GET /agents/{id}/persona_state to upstream.
+POST: [POST-001 return_value] 200 with PersonaSnapshot on upstream success
+STEPS:
+  1. [parse] agent_id = request.path_params["agent_id"]
+  2. [proxy] async with client_factory() as client: snap = await get_persona_state(client, agent_id)
+  3. [return] JSONResponse(snap, status_code=200)
+ERRORS:
+  PersonaNotConfigured -> JSONResponse({"error_code": "persona_not_configured"}, 404)
+  AgentNotAvailable -> JSONResponse({"error_code": "agent_not_available"}, 404)
+  AuthScopeDenied -> JSONResponse({"error_code": "auth_scope_denied"}, 403)
+TESTS:
+  happy [tracer]: respx mock 200 → endpoint returns 200 with snapshot
+  persona_not_configured [error]: respx mock 404 + persona_not_configured → 404 envelope
+  agent_not_available [error]: respx mock 404 + agent_not_available → 404 envelope
+  auth_scope_denied [error]: respx mock 403 + auth_scope_denied → 403 envelope
+```
+
+```contract
+FN submit_turn_endpoint(request: Request) -> JSONResponse
+BRIEF: Accept a prompt-submit; allocate a turn_id in the registry; return it. NO upstream call yet — the stream endpoint opens that.
+PRE: [PRE-001 hard] request body has "content" key -- 400 if missing
+POST: [POST-001 return_value] 200 with {"turn_id": <int>}
+POST: [POST-002 state_change] app.state.turn_registry has entry for (sid, turn_id) with content + status "queued"
+STEPS:
+  1. [parse] session_id = path_params["session_id"]; body = await request.json(); content = body["content"]
+  2. [allocate] turn_id = next_turn_id()  # process-local monotonic counter
+  3. [register] turn_registry[(session_id, turn_id)] = TurnHandle(content=content, status="queued", upstream_response=None)
+  4. [return] JSONResponse({"turn_id": turn_id}, status_code=200)
+TESTS:
+  happy [tracer]: POST {"content": "hi"} → 200 with turn_id; registry populated
+  missing_content [adversarial]: body without content → 400
+  monotonic_turn_ids [trace]: two submits → second turn_id > first turn_id
+```
+
+```contract
+FN stream_turn_endpoint(request: Request) -> StreamingResponse
+BRIEF: Open SSE stream to browser — proxy upstream stream_turn() events, forward as SSE.
+PRE: [PRE-001 hard] (session_id, turn_id) in registry -- 404 if absent
+POST: [POST-001 side_effect] each upstream event serialized to browser as SSE event with type+data per fixture
+POST: [POST-002 state_change] on completion/disconnect, registry entry removed; upstream cancel if turn still in flight
+STEPS:
+  1. [validate] sid, tid = path/query params; handle = registry.get((sid, tid)); 404 if None
+  2. [open] async with client_factory() as client:
+     - upstream = stream_turn(client, sid, handle.content)
+     - handle.upstream_response = upstream
+     - handle.status = "streaming"
+  3. [forward] async for event in upstream:
+     - serialize per fixture: {"type": <ssetype>, "data": <json>}
+     - yield as `event: <type>\\ndata: <json>\\n\\n` bytes
+  4. [terminal] on Done/Error/Cancelled: yield final SSE, mark handle.status, break
+  5. [cleanup] finally:
+     - IF asyncio.CancelledError caught and turn in-flight: upstream cancel via cancel_turn(client, sid, tid)
+     - remove (sid, tid) from registry
+ERRORS:
+  KeyError -> 404 turn_not_found
+  asyncio.CancelledError -> upstream cancel, propagate
+  SseConnectFailed -> yield synthetic error event, close stream
+  SseConnectionDropped -> yield synthetic error event, close stream
+TESTS:
+  happy [tracer]: respx mock one text+done → SSE stream yields text event + done event
+  unknown_turn [error]: GET with turn_id not in registry → 404
+  upstream_error [error]: respx 500 on /sessions/{sid}/messages → synthetic error SSE event
+  disconnect_triggers_cancel [scenario]: browser disconnect mid-stream → cancel_turn called on upstream
+  full_event_vocab [scenario]: respx with one of each Event type → fixture-shaped JSON for each
+```
+
+```contract
+FN cancel_turn_endpoint(request: Request) -> JSONResponse
+BRIEF: Proxy upstream cancel for a registered turn.
+PRE: [PRE-001 hard] (session_id, turn_id) in registry -- 404 if absent
+POST: [POST-001 side_effect] upstream cancel call lands; registry entry removed
+POST: [POST-002 return_value] 200 with {"cancelled": true} or 200 with status reflecting upstream race
+STEPS:
+  1. [validate] sid, tid = params; handle = registry.get((sid, tid)); 404 if None
+  2. [cancel] async with client_factory() as client:
+     - try: await cancel_turn(client, sid, tid)
+     - return 200 {"cancelled": true}
+  3. [race] EXCEPT CancelAlreadyCompleted / CancelTurnNotFound:
+     - return 200 {"cancelled": false, "reason": "race_or_completed"}
+  4. [cleanup] del registry[(sid, tid)]
+TESTS:
+  happy [tracer]: registered turn → POST cancel → 200, upstream cancel called
+  unknown_turn [error]: not in registry → 404
+  already_completed [race]: respx cancel returns 409 → 200 with reason=race_or_completed
+  cancel_failed [error]: respx returns 500 → 500 with cancel_failed envelope
+```
+
+```contract
+FN root_endpoint(request: Request) -> FileResponse
+BRIEF: Serve the static index.html.
+POST: [POST-001 return_value] FileResponse for ratatoskr/web/static/index.html, status 200, content-type text/html
+STEPS:
+  1. [resolve] path = importlib.resources.files("ratatoskr.web") / "static" / "index.html"
+  2. [return] FileResponse(path, media_type="text/html")
+TESTS:
+  happy [tracer]: GET / → 200, content-type text/html, body contains "<html"
+```
+
+```contract
+FN lifespan_shutdown(app: Starlette) -> None
+BRIEF: On Ctrl-C / SIGTERM, drain the turn registry within 5s budget per INV-006.
+POST: [POST-001 side_effect] every in-flight upstream turn gets a cancel attempt within budget
+POST: [POST-002 side_effect] entries that don't ack in budget logged + abandoned
+STEPS:
+  1. [collect] handles = list(app.state.turn_registry.values())
+  2. [cancel] async with client_factory() as client:
+     - tasks = [cancel_turn(client, h.session_id, h.turn_id) for h in handles if h.status == "streaming"]
+     - done, pending = await asyncio.wait(tasks, timeout=5.0)
+  3. [log] for each pending: log {"kind": "shutdown", "event": "cleanup_timeout", session/turn}
+  4. [clear] registry.clear()
+TESTS:
+  happy [tracer]: 2 in-flight turns + shutdown → both upstream cancels called, registry empty
+  timeout [scenario]: 1 hanging cancel + 1 normal → normal succeeds, hanging logged as cleanup_timeout
+```
@@ -55,6 +55,69 @@ conversation_api:

 ---

+## Authorization model — agent invocation
+
+When you call `POST /sessions` against an agent, the authorization check that fires depends on **which kind of agent** you target. There are two distinct scope namespaces — the spelling differs by one character (`agent` vs `agents`) and the granting mechanism differs entirely. Confusing the two is a common source of bug reports.
+
+### Tier 1 — foundational agents (no `:` in agent_id)
+
+Agents bundled with Worldtree: `mimir`, `lofn`, `soong`, `forseti`, `domari`, `vili`, `actor`, `saga`, `bragi`, `leif`, `troi`, `cara`, `glados`, and any future Asgardian. The agent_id is a simple slug like `mimir` — no colon.
+
+> **About tiers:** Your `tier` is set on the `users` table row your API key resolves to, assigned at key-mint time (see `POST /admin/keys`). Tiers are `anonymous` (dev-mode unauthenticated), `user` (default for newly-issued keys), `free`/`pro` (subscription-shaped, not actively differentiated), and `admin`. The tier you have is visible via `GET /me`'s `tier` field. Tier-derived scopes come from `config/policies.yaml > tiers.<tier>.scopes` — there is no per-key scope override.
+
+**Authorization rule (singular `agent`):**
+
+```yaml
+- id: agent-call-baseline-allow
+  principal:
+    tiers: ["anonymous", "user", "free", "pro", "admin"]
+  action: "agent.call:*"
+  resource: "*"
+  effect: allow
+```
+
+This baseline rule lives at `config/policies.yaml`. Every authenticated tier — including the `user` tier that newly-issued keys default to — already passes this check for every Tier 1 agent. **There is no per-agent scope you can add to "grant" Tier 1 access; it's covered by tier.**
+
+If you get a 422 calling a Tier 1 agent (e.g., `lofn` rejecting with `end_user_id_required`), that's a **request-body validation**, not a scope denial. Check the `error_code` in the response detail — `END_USER_ID_REQUIRED` means the agent requires an `end_user_id` field in the request body; `AUTH_SCOPE_DENIED` (403) would be the actual scope problem. They're not interchangeable.
+
+### Tier 3 — consumer-defined agents (`:` in agent_id)
+
+Agents created at runtime via `POST /agents/define`. The agent_id is `<owner_user_id>:<agent_name>`, e.g., `acme:support-bot`. The `:` in the path is the trigger that switches the auth model.
+
+**Authorization is DB-backed per-resource, NOT policy-driven (plural `agents`):**
+
+```
+scope action checked: agents.call:<owner_user_id>:<agent_name>
+                       ^^^^^^
+                       PLURAL — different namespace from Tier 1
+```
+
+There is **no blanket allow rule** for `agents.call:*` in policy. The grant comes from the live `consumer_agents` table:
+
+- A non-soft-deleted row in `consumer_agents` owned by `ctx.user_id` IS the grant.
+- Cascade soft-delete and owner-initiated `DELETE` revoke it.
+- Missing row → policy defaults to deny (403 `auth_scope_denied`).
+
+To "add the scope" for a Tier 3 agent, you don't amend any config or call an admin endpoint — you `POST /agents/define` to register it under your `user_id`. Owning the row IS the grant. You cannot call another user's Tier 3 agent; ownership is checked at session-create (`row.user_id == ctx.user_id`).
+
+### Common pitfalls
+
+- **Singular vs plural.** Tier 1 uses `agent.call:*` (singular `agent`). Tier 3 uses `agents.call:<owner>:<name>` (plural `agents`). One character difference, two completely different mechanisms. There is no Tier 1 scope named `agent.call:mimir` or `agents.call:mimir` — Tier 1 is granted by baseline rule, not per-agent name.
+- **No scope-mutation API.** `POST /admin/keys` accepts `{user_id, label, tier}` only. There is no per-key scope override mechanism in the storage schema. To change a user's effective scopes, change their `tier`, not their key. Per-resource Tier 3 grants flow through `POST /agents/define` (and its DELETE counterpart), not through admin endpoints.
+- **422 vs 403.** A 422 is body-validation (e.g., `end_user_id_required`); a 403 is auth-policy denial (`auth_scope_denied`). Different fix paths. Read the `error_code` in `detail`.
+
+### Quick decision table for consumers
+
+| Target | Auth requirement |
+|---|---|
+| Tier 1 agent (e.g., `mimir`) | Authenticated tier ≥ `user`. No additional body requirements |
+| Tier 1 agent `lofn` (the default welcoming intermediary) | Authenticated tier ≥ `user` + `end_user_id` field required in request body. 422 `END_USER_ID_REQUIRED` if absent |
+| Tier 3 agent (any agent_id containing `:`) | `end_user_id` field required in body. AND the row must be owner-matched: `POST /agents/define` first to create a row under your `user_id`, then session-create works against your existing key. Cross-user Tier 3 invocation is rejected with 403 |
+
+> **Programmatic discovery of `end_user_id` requirements:** as of v0.22.x there is no field on `GET /agents` indicating which agents require `end_user_id` — the spec line above (lofn + Tier 3) is the authoritative list, and 422 `END_USER_ID_REQUIRED` is the fallback signal at request time. Adding a discoverable `requires_end_user_id` field on `AgentInfoResponse` is on the table as a small future capability; ping if you want to drive it.
+
+---
+
 ## GET /me

 Returns the authenticated principal's identity and key metadata. Lets a client verify its key on boot without triggering agent-config-loading side effects.
@@ -1878,6 +1941,65 @@ Tool-using turns cycle through `CallingLLM → ProcessingTools → CallingLLM

 Clients that don't need phase events can filter on `event["type"] != "worker_phase"` client-side. Existing SSE consumers that switch on `event["type"]` ignore this event type without code changes.

+### affect_update
+
+Persona-state observability event (issue #204). Fires twice per turn for agents with `persona.enabled: true` on non-ephemeral sessions; suppressed entirely for persona-disabled agents (e.g. `domari`, `muninn`), Tier 3 consumer-defined agents (Phase 2.0), and ephemeral sessions.
+
+**Start-of-turn — `status: "current"`:**
+
+Emitted immediately at the start of each qualifying turn, before any `worker_phase` event. Carries the agent's current persona snapshot reflecting all prior turns' completed appraisals.
+
+```json
+{
+  "type": "affect_update",
+  "status": "current",
+  "turn_id": 42,
+  "snapshot": {
+    "agent_id": "mimir",
+    "pad": {"pleasure": 0.52, "arousal": 0.47, "dominance": 0.50},
+    "dominant_emotion": "curiosity",
+    "emotions_active": [
+      {"type": "curiosity", "intensity": 0.6, "decay_remaining_s": 202.7}
+    ],
+    "baseline_pad": {"pleasure": 0.50, "arousal": 0.40, "dominance": 0.50},
+    "mood_drift": {"valence_delta": 0.02, "arousal_delta": 0.07},
+    "last_updated_at": "2026-05-25T22:30:18+00:00"
+  }
+}
+```
+
+**End-of-turn — `status: "scheduled"`:**
+
+Emitted after the post-turn appraisal task has been scheduled (per #177 Phase A's fire-and-forget discipline) and before `done`. Lightweight notification — no PAD numbers, since the appraisal is still running asynchronously. The result lands in the NEXT turn's `status: "current"` snapshot.
+
+```json
+{"type": "affect_update", "status": "scheduled", "turn_id": 42}
+```
+
+`scheduled` is skipped on turn failure/cancel paths (the appraisal was never reached); `current` still fires unconditionally for qualifying turns.
+
+Bootstrap reads available via `GET /agents/{agent_id}/persona_state` (same `snapshot` shape, requires `persona.read` scope).
+
+### awaiting_llm_first_token
+
+Periodic heartbeat event (issue #201) emitted at a configurable interval during the gap between `worker_phase: phase="BuildingPrompt"` and `worker_phase: phase="CallingLLM"`. Solves the legitimate-slow first-token visibility gap: consumer TUIs can render a "thinking for Ns…" timer rather than a frozen line during heavy-CoT prompt warmup.
+
+```json
+{
+  "type": "awaiting_llm_first_token",
+  "turn_id": 42,
+  "elapsed_ms_since_building_prompt": 5012.3
+}
+```
+
+`elapsed_ms_since_building_prompt` is the server-authoritative wall-clock milliseconds since `BuildingPrompt` was emitted. Independent of network latency or clock skew.
+
+Heartbeats stop the moment the engine produces its first event (the `CallingLLM` marker). They do NOT re-fire during tool-roundtrip `CallingLLM` re-entries — the heartbeat is scoped to the FIRST `BuildingPrompt → CallingLLM` gap only.
+
+**Configuration:** `conversation_api.awaiting_llm_first_token_heartbeat_s` (default `5.0`). Per-agent override via `agent.conversation.awaiting_llm_first_token_heartbeat_s`. Value `0.0` disables emission entirely.
+
+Cancellation paths (stall watchdog, user-cancel) also stop the heartbeat — no `awaiting_llm_first_token` event appears after the terminal `cancelled` event.
+
 ### thinking

 Incremental reasoning/thinking content (from thinking-enabled models).
@@ -1851,6 +1851,103 @@ SQLite `consumer_agents` table.
  before any other processing; non-slug user_ids return 403
  `tier3_user_id_unsupported`.

+### Persona-state observability (issue #204)
+
+- **INV-204-1 (affect_update event type)**: `affect_update` is a
+  top-level SSE event `type` discriminator, sibling to `worker_phase`
+  / `tool_*` / `text` / `thinking` / `done`. Not a `worker_phase` sub-
+  phase. INV-061's "BuildingPrompt is the FIRST event" property is
+  scoped to `worker_phase` events only — `affect_update status="current"`
+  may precede BuildingPrompt for persona-enabled agents.
+- **INV-204-2 (per-turn emission)**: For agents with persona enabled
+  on non-ephemeral sessions, `stream_turn` emits `status="current"`
+  before any other SSE event on a successful or failed turn, and
+  `status="scheduled"` after `update_after_turn` schedules the
+  appraisal task (success path only — skipped on cancel / error
+  before update_after_turn was reached). See contract
+  `docs/contracts/issues/204.contract.md`.
+- **INV-204-3 (emission suppression)**: Persona-disabled agents and
+  ephemeral sessions emit ZERO `affect_update` events.
+- **INV-204-6 / INV-204-7 (persona_state endpoint)**: New
+  `GET /agents/{agent_id}/persona_state` gated on Heimdall scope
+  `persona.read`. Route ordering: auth → Tier 3 short-circuit (404
+  `persona_not_configured`) → Tier 1/2 existence (404
+  `agent_not_available`) → persona-enabled check (404
+  `persona_not_configured`) → snapshot (200).
+- **INV-204-9 (read-only registry primitive)**: `PersonaRegistry.get_state`
+  is mutex-free and never mutates `persona.emotions`. Eventual
+  consistency under concurrent `_appraisal_wrapper` mutations.
+- **INV-204-14 (replay participation)**: `affect_update` events flow
+  through `_publish`, so SSE resume / replay handles them with no
+  special case.
+
+## Amendment — AwaitingLLMFirstToken heartbeat (issue #201, INV-201-1..7)
+
+Adds a periodic SSE heartbeat event during the gap between
+`BuildingPrompt` and `CallingLLM` so consumers can distinguish
+"engine is thinking" from "engine is wedged" without out-of-band
+server inspection. Filed by ratatoskr-dev; ships in v0.29.0.
+
+- **INV-201-1 (new top-level event type)**: `awaiting_llm_first_token`
+  is a new top-level SSE event type, sibling to `worker_phase` /
+  `tool_*` / `text` / `thinking` / `debug` / `done` / `affect_update`.
+  `_WORKER_PHASE_VOCAB` is NOT extended; INV-053 / INV-054 unchanged.
+  Same precedent as #204's `affect_update`.
+
+- **INV-201-2 (config-gated emission)**: Heartbeat emission requires
+  `awaiting_llm_first_token_heartbeat_s > 0.0`. When the resolved
+  value is `0.0`, the heartbeat task is never started and zero
+  `awaiting_llm_first_token` events emit for the turn. When > 0.0,
+  the task starts immediately after `_publish_phase("BuildingPrompt")`
+  and emits an event every `interval` seconds until cancelled.
+
+- **INV-201-3 (defense-in-depth cancellation)**: The heartbeat task
+  is cancelled at three sites (idempotent via the `_cancel_heartbeat`
+  helper): (a) immediately before `_publish_phase("CallingLLM")` on
+  the engine-first-event path; (b) inside the `cancelled`/`error`
+  handling that wraps `_handle_cancel` (covers stall + user-cancel
+  paths); (c) in the outer `finally` block alongside
+  `_clear_stall_timer`. After cancellation, no further
+  `awaiting_llm_first_token` events emit.
+
+- **INV-201-4 (wire shape)**: Payload is exactly `{type:
+  "awaiting_llm_first_token", turn_id: <int>,
+  elapsed_ms_since_building_prompt: <float>}` plus the composite `id:
+  "<turn_id>:<seq>"` stamped by `_publish`. No additional fields.
+  `elapsed_ms_since_building_prompt` is `(time.monotonic() -
+  building_prompt_t) * 1000.0` where `building_prompt_t` is captured
+  immediately before `BuildingPrompt` is published.
+
+- **INV-201-5 (first-gap-only scope)**: Heartbeat is scoped to the
+  FIRST `BuildingPrompt → CallingLLM` gap of the turn. Tool round-trip
+  `CallingLLM` re-entries (INV-058) emit ZERO
+  `awaiting_llm_first_token` events. Out-of-scope sub-phases
+  (`AwaitingToolResult`, `AwaitingNextLLMCall`) would be separate
+  follow-up features.
+
+- **INV-201-6 (replay participation)**: Heartbeat events flow through
+  `_publish → _replay_buffer + queue` per INV-060 — same replay
+  semantics as worker_phase events. On `Last-Event-ID` reconnect,
+  prior heartbeats replay identically.
+
+- **INV-201-7 (config resolution precedence)**: Per-agent
+  `agent.conversation.awaiting_llm_first_token_heartbeat_s` →
+  `api_cfg.awaiting_llm_first_token_heartbeat_s` → built-in `5.0`.
+  Negative values raise `ConfigurationError` at agent load; `0.0`
+  is valid and means "disabled." Mirrors the `_resolve_stall_timeout_s`
+  precedence pattern (INV-038).
+
+### Mechanism note
+
+The heartbeat task is a separate `asyncio.Task` (NOT `loop.call_later`,
+because heartbeats repeat at an interval rather than fire once at a
+timeout). An `asyncio.Queue` shared between the heartbeat task and the
+generator carries events; the generator uses
+`asyncio.wait(return_when=FIRST_COMPLETED)` to race the engine's
+`__anext__` against the heartbeat queue's `get` ONLY during the first
+iteration. After `CallingLLM` fires, the heartbeat task is cancelled
+and subsequent iterations use the original non-race pattern.
+
 ### Storage extension

 The `consumer_agents` table lives in `core/heimdall/storage/sqlite.py`
@@ -32,9 +32,9 @@ separate dev team rather than an in-tree Worldtree tool.

 ## Current state / in-flight

-_As of 2026-05-25 (post-v0.7.0 Tier 3 agent lifecycle):_
+_As of 2026-05-25 (post-v0.8.2 drop double-print; v0.9.0 live-md next):_

-**Status: v0.7.0 shipped.** Ten core features complete (`sse_client`
+**Status: v0.8.2 shipped.** Eleven core features complete (`sse_client`
 #1, `sessions` #2, `cli` #3, `tui` #4, `--end-user-id` #5, TUI
 startup error visibility #6, presenter contract semantics amendment
 #12, startup agent picker #8, §5 layout reshape + Tools pane #13)
@@ -51,7 +51,11 @@ Static in the footer (static "Tools" v1; dynamic when more tabs
 land). CLI mode (--send) unaffected by design — INV-018.

 Last commits on `main`:
- v0.7.0 feat(tier3): ratatoskr.tier3 module + CLI — Worldtree Tier 3 lifecycle
+- v0.8.2 fix(tui): drop post-Done Markdown body re-render (no double-print)
+- `11ef683` fix(tui,sse): inline Text streaming + empty-id keepalive skip (v0.8.1)
+- `9fade55` feat(local_agents): JSON-backed local tier-3 index + picker merge (v0.8.0)
+- `9918c10` fix(tui): coalesce thinking deltas on `\n` (v0.7.1)
+- `c086ae2` feat(tier3): ratatoskr.tier3 module + CLI (v0.7.0)
 - `d356990` refactor(tui): thinking streams into thinking-log (v0.6.5)
 - `82437bd` style(tui): picker highlighted item → Aurora blue (v0.6.4)
 - `ac690c1` style(tui): restore Australis palette, only $background → pure black (v0.6.3)
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"

 [project]
 name = "ratatoskr"
-version = "0.7.0"
+version = "0.15.0"
 description = "Worldtree Conversation API debug TUI — multi-pane observability dashboard"
 readme = "README.md"
 requires-python = ">=3.12"
@@ -21,6 +21,10 @@ dependencies = [
 ]

 [project.optional-dependencies]
+web = [
+    "starlette>=0.40",
+    "uvicorn[standard]>=0.30",
+]
 dev = [
    "pytest>=8",
    "pytest-asyncio>=0.24",
@@ -29,10 +33,12 @@ dev = [
    "mypy>=1.11",
    "textual-dev>=1.5",     # textual console + live reload during dev
    "pyyaml>=6",            # used by docs/contracts/contract_parser.py and scripts/contract_drift_check.py
+    "ratatoskr[web]",       # web extras included in dev so test_web_* can import starlette
 ]

 [project.scripts]
-ratatoskr = "ratatoskr.cli:main"
+ratatoskr     = "ratatoskr.cli:main"
+ratatoskr-web = "ratatoskr.web.entrypoint:main"

 [project.urls]
 Repository = "https://gitea.phasefinal.com/vh/ratatoskr"
@@ -42,13 +48,18 @@ Repository = "https://gitea.phasefinal.com/vh/ratatoskr"
 # Ratatoskr is built against Worldtree at this commit; the vendored
 # spec snapshot in docs/ reflects that SHA.
 [tool.ratatoskr.spec-pin]
-worldtree-spec-rev = "55101e909abcd2219833266b6f905c5bc956e0f0"
-worldtree-version = "v0.19.0"
-pinned-on = "2026-05-20"
+worldtree-spec-rev = "562001af28d752c3a60d449c7ddd09f44fa9dc9a"
+worldtree-version = "v0.29.0"
+pinned-on = "2026-05-26"

 [tool.hatch.build.targets.wheel]
 packages = ["src/ratatoskr"]

+# Issue #16: ship the web companion's static HTML in the wheel so
+# importlib.resources can locate it post-install.
+[tool.hatch.build.targets.wheel.force-include]
+"src/ratatoskr/web/static" = "ratatoskr/web/static"
+
 [tool.pytest.ini_options]
 asyncio_mode = "auto"
 testpaths = ["tests"]
@@ -18,6 +18,8 @@ import httpx

 from ratatoskr.sessions import AgentNotFound, SessionApiFailed, create_session
 from ratatoskr.sse_client import (
+    AffectUpdate,
+    AwaitingLlmFirstToken,
    CancelAlreadyCompleted,
    CancelFailed,
    Cancelled,
@@ -205,6 +207,7 @@ class CliPresenterState:
            (
                WorkerPhase, Thinking, Text, TextBoundary,
                ToolStart, ToolResult, Done, Error, Cancelled,
+                AffectUpdate, AwaitingLlmFirstToken,
            ),
        )
        # Thinking events accumulate into the open run.
@@ -275,6 +278,28 @@ class CliPresenterState:
                f". text_boundary: kind={event.kind} char_offset={event.char_offset}\n"
            )
            return
+        if isinstance(event, AffectUpdate):
+            # Worldtree #204 / v0.28.0. CLI surface is debug telemetry —
+            # one line to stderr with status + (for current) dominant_emotion.
+            if event.snapshot is not None:
+                dom = event.snapshot.get("dominant_emotion")
+                stderr.write(
+                    f". affect_update: status={event.status} turn_id={event.turn_id} "
+                    f"dominant_emotion={dom!r}\n"
+                )
+            else:
+                stderr.write(
+                    f". affect_update: status={event.status} turn_id={event.turn_id}\n"
+                )
+            return
+        if isinstance(event, AwaitingLlmFirstToken):
+            # Worldtree #201 / v0.29.0. Heartbeat during BuildingPrompt →
+            # CallingLLM gap. Stderr surface, one line per heartbeat.
+            secs = event.elapsed_ms_since_building_prompt / 1000.0
+            stderr.write(
+                f". awaiting_llm_first_token: turn_id={event.turn_id} elapsed={secs:.1f}s\n"
+            )
+            return


 async def _cancel_and_log(
@@ -0,0 +1,134 @@
+"""Local index of tier-3 agents defined via `python -m ratatoskr.tier3`.
+
+Workaround for Worldtree's ``GET /agents`` not returning consumer-defined
+agents (the public list excludes tier-3 per-spec; see issue #15 smoke
+findings). Local file maintains a list of agent_ids + display metadata so
+the picker can show them alongside foundational agents.
+
+Storage shape: JSON at ``$XDG_CONFIG_HOME/ratatoskr/local_agents.json``
+(default ``~/.config/ratatoskr/local_agents.json``). Override via
+``$RATATOSKR_LOCAL_AGENTS`` env var for tests / per-machine isolation.
+
+If Worldtree later starts returning tier-3 agents in ``GET /agents``, this
+module's role narrows to redundant local cache; can be removed cleanly
+since the picker's dedup-by-agent-id keeps remote-wins behavior.
+
+Failure modes are lenient: missing file → empty index; corrupt JSON or
+schema mismatch → empty index (no crash). The picker continues to show
+foundational agents either way; the local-tier-3 surface degrades to
+"operator passes --agent ratatoskr:<name> explicitly" — the
+pre-v0.8.0 workflow.
+"""
+
+from __future__ import annotations
+
+import json
+import os
+from dataclasses import asdict, dataclass
+from pathlib import Path
+
+_SCHEMA_VERSION = 1
+
+
+@dataclass(frozen=True)
+class LocalAgentEntry:
+    """One row in the local tier-3 agent index.
+
+    Schema:
+      - ``agent_id``: full "user_id:agent_name" string (Worldtree-owned).
+      - ``agent_name``: slug from define (display name).
+      - ``model``: provider model ID at last define/patch.
+      - ``description``: synthetic display string (typically derived from
+        the system_prompt's first line + a "(tier 3)" prefix; the picker
+        uses this in its ``{id} · {name} — {description}`` rendering).
+      - ``defined_at``: ISO-8601 timestamp from the Tier3AgentInfo response.
+    """
+
+    agent_id: str
+    agent_name: str
+    model: str
+    description: str
+    defined_at: str
+
+
+def _local_agents_path() -> Path:
+    """Resolve the local index file path with XDG + env-var override."""
+    override = os.environ.get("RATATOSKR_LOCAL_AGENTS")
+    if override:
+        return Path(override)
+    xdg = os.environ.get("XDG_CONFIG_HOME")
+    base = Path(xdg) if xdg else (Path.home() / ".config")
+    return base / "ratatoskr" / "local_agents.json"
+
+
+def load_local_agents() -> list[LocalAgentEntry]:
+    """Read the local index. Returns ``[]`` on missing file, corrupt JSON,
+    schema mismatch, or any read error — never raises.
+    """
+    path = _local_agents_path()
+    if not path.exists():
+        return []
+    try:
+        raw = json.loads(path.read_text())
+    except (json.JSONDecodeError, OSError):
+        return []
+    if not isinstance(raw, dict) or raw.get("version") != _SCHEMA_VERSION:
+        return []
+    agents = raw.get("agents", [])
+    if not isinstance(agents, list):
+        return []
+    out: list[LocalAgentEntry] = []
+    for item in agents:
+        if not isinstance(item, dict):
+            continue
+        try:
+            out.append(LocalAgentEntry(**item))
+        except TypeError:
+            # Malformed row (missing/extra fields) — skip silently.
+            continue
+    return out
+
+
+def _save_local_agents(agents: list[LocalAgentEntry]) -> None:
+    """Persist the index. Creates parent dir as needed."""
+    path = _local_agents_path()
+    path.parent.mkdir(parents=True, exist_ok=True)
+    payload = {"version": _SCHEMA_VERSION, "agents": [asdict(a) for a in agents]}
+    path.write_text(json.dumps(payload, indent=2))
+
+
+def add_local_agent(entry: LocalAgentEntry) -> None:
+    """Add (or replace) an agent in the local index. agent_id is the key."""
+    agents = [a for a in load_local_agents() if a.agent_id != entry.agent_id]
+    agents.append(entry)
+    _save_local_agents(agents)
+
+
+def update_local_agent(entry: LocalAgentEntry) -> None:
+    """Update an existing entry. Identical semantics to ``add_local_agent``
+    (agent_id is the dedup key), exposed separately so callers can
+    self-document intent.
+    """
+    add_local_agent(entry)
+
+
+def remove_local_agent(agent_id: str) -> None:
+    """Remove an entry by agent_id. No-op if absent (idempotent)."""
+    agents = [a for a in load_local_agents() if a.agent_id != agent_id]
+    _save_local_agents(agents)
+
+
+def make_description(system_prompt: str) -> str:
+    """Synthesize a one-line description for the picker from a system prompt.
+
+    Strategy: first non-empty line, stripped of leading markdown heading
+    markers and whitespace, prefixed with "(tier 3) ", truncated to 80
+    chars. Falls back to "(tier 3) custom system prompt" if the prompt is
+    empty (defensive — define rejects empty prompts at PRE-002).
+    """
+    for line in system_prompt.splitlines():
+        stripped = line.lstrip("# ").strip()
+        if stripped:
+            label = f"(tier 3) {stripped}"
+            return label[:80] + ("…" if len(label) > 80 else "")
+    return "(tier 3) custom system prompt"
@@ -89,6 +89,46 @@ class SessionApiFailed(Exception):
        self.body = body


+# Worldtree #204 / v0.28.0 — persona_state endpoint failure modes.
+class PersonaNotConfigured(Exception):
+    """Raised on HTTP 404 `persona_not_configured` from GET persona_state.
+
+    Agent exists but has no persona surface: persona-disabled Tier 1/2
+    agents (e.g. `domari`, `muninn`) and all Tier 3 consumer-defined
+    agents (Phase 2.0). Distinct from `AgentNotAvailable` which means the
+    agent_id is unknown entirely.
+    """
+
+    def __init__(self, *, agent_id: str) -> None:
+        super().__init__(f"persona not configured for agent_id: {agent_id!r}")
+        self.agent_id = agent_id
+
+
+class AgentNotAvailable(Exception):
+    """Raised on HTTP 404 `agent_not_available` from GET persona_state.
+
+    The agent_id is unknown to the server. Distinct from
+    `PersonaNotConfigured` (agent exists but has no persona).
+    """
+
+    def __init__(self, *, agent_id: str) -> None:
+        super().__init__(f"agent not available: {agent_id!r}")
+        self.agent_id = agent_id
+
+
+class AuthScopeDenied(Exception):
+    """Raised on HTTP 403 `auth_scope_denied` from a Heimdall-scoped endpoint.
+
+    The API key lacks the required scope (e.g. `persona.read` for
+    GET /agents/{id}/persona_state). User-tier keys carry `persona.read`
+    by default; this surfaces when a narrower key is in use.
+    """
+
+    def __init__(self, *, scope: str) -> None:
+        super().__init__(f"auth scope denied: required={scope!r}")
+        self.scope = scope
+
+
 async def list_sessions(
    client: httpx.AsyncClient,
    *,
@@ -200,3 +240,45 @@ async def list_agents(client: httpx.AsyncClient) -> list[AgentInfo]:
        )
        for item in body
    ]
+
+
+async def get_persona_state(
+    client: httpx.AsyncClient, agent_id: str
+) -> dict[str, Any]:
+    """GET /agents/{agent_id}/persona_state — fetch current persona snapshot.
+
+    Worldtree #204 / v0.28.0. Returns the same `snapshot` dict shape as the
+    `affect_update` SSE event's `status="current"` emission: pad,
+    dominant_emotion, emotions_active, baseline_pad, mood_drift,
+    last_updated_at. Bootstrap read for clients that want to populate a
+    persona pane on session-open without waiting for turn-1's `affect_update`.
+
+    Auth: requires Heimdall `persona.read` scope (user-tier default).
+
+    Failure modes (mapped to typed exceptions per the spec error_codes):
+      - 404 `persona_not_configured` → PersonaNotConfigured (persona-disabled
+        agents: domari / muninn, and all Tier 3 in Phase 2.0)
+      - 404 `agent_not_available` → AgentNotAvailable (unknown agent_id)
+      - 403 `auth_scope_denied` → AuthScopeDenied (key lacks persona.read)
+      - any other non-2xx → SessionApiFailed (preserves the broader-error
+        precedent from list_agents / list_sessions / create_session)
+    """
+    assert client is not None
+    assert agent_id and isinstance(agent_id, str)
+
+    resp = await client.get(f"/agents/{agent_id}/persona_state")
+    if resp.status_code == 200:
+        return resp.json()
+    # Discriminate the 4xx error_code sub-codes; everything else falls through.
+    try:
+        err = resp.json()
+        error_code = err.get("error_code") if isinstance(err, dict) else None
+    except ValueError:
+        error_code = None
+    if resp.status_code == 404 and error_code == "persona_not_configured":
+        raise PersonaNotConfigured(agent_id=agent_id)
+    if resp.status_code == 404 and error_code == "agent_not_available":
+        raise AgentNotAvailable(agent_id=agent_id)
+    if resp.status_code == 403 and error_code == "auth_scope_denied":
+        raise AuthScopeDenied(scope="persona.read")
+    raise SessionApiFailed(status=resp.status_code, body=resp.content)
@@ -111,6 +111,55 @@ class Cancelled:
    partial_message_id: int | None


+@dataclass(frozen=True)
+class AwaitingLlmFirstToken:
+    """SSE event `awaiting_llm_first_token`: heartbeat during slow first-token.
+
+    Fires at the configured interval (default 5s) during the gap between
+    `worker_phase` phase=BuildingPrompt and phase=CallingLLM. Lets clients
+    render a live "thinking for Ns…" indicator instead of a frozen line
+    during legitimate-slow first-token latency. Stops the moment CallingLLM
+    fires (defense-in-depth at three sites); no heartbeat after Cancelled
+    or stalled terminal events. Tool round-trip re-entries do NOT re-fire
+    heartbeats — INV-201-5 scopes the mechanism to the FIRST gap only.
+
+    `elapsed_ms_since_building_prompt` is server-authoritative
+    `time.monotonic()`-based — independent of network latency or clock
+    skew, monotonically increasing across the heartbeat sequence.
+
+    See docs/conversation-api-spec.md § awaiting_llm_first_token
+    (Worldtree #201, v0.29.0).
+    """
+
+    sse_id: SseId
+    turn_id: int
+    elapsed_ms_since_building_prompt: float
+
+
+@dataclass(frozen=True)
+class AffectUpdate:
+    """SSE event `affect_update`: persona-state observability snapshot.
+
+    Two emissions per qualifying turn (persona-enabled agent on non-
+    ephemeral session): `status="current"` at turn start carrying the full
+    snapshot, `status="scheduled"` after post-turn appraisal kicks off
+    (lightweight — `snapshot` is None). Suppressed entirely for persona-
+    disabled agents (e.g. `domari`, `muninn`), Tier 3 consumer-defined
+    agents (Phase 2.0), and ephemeral sessions.
+
+    Bootstrap reads available via `GET /agents/{agent_id}/persona_state`
+    (same `snapshot` shape, requires `persona.read` scope).
+
+    See docs/conversation-api-spec.md § affect_update (Worldtree #204,
+    v0.28.0).
+    """
+
+    sse_id: SseId
+    status: str  # "current" | "scheduled"
+    turn_id: int
+    snapshot: dict[str, Any] | None  # None when status="scheduled"
+
+
 Event = (
    WorkerPhase
    | Thinking
@@ -121,6 +170,8 @@ Event = (
    | Done
    | Error
    | Cancelled
+    | AffectUpdate
+    | AwaitingLlmFirstToken
 )


@@ -284,6 +335,26 @@ def _envelope_for_type(body: dict[str, Any], sse_id: SseId) -> Event:
            reason=body.get("reason"),
            partial_message_id=body.get("partial_message_id"),
        )
+    if t == "awaiting_llm_first_token":
+        # Worldtree #201 / v0.29.0: top-level heartbeat during BuildingPrompt
+        # → CallingLLM gap. Lets clients render live elapsed-time indicators
+        # instead of frozen lines on legitimate-slow first-token latency.
+        return AwaitingLlmFirstToken(
+            sse_id=sse_id,
+            turn_id=body["turn_id"],
+            elapsed_ms_since_building_prompt=body["elapsed_ms_since_building_prompt"],
+        )
+    if t == "affect_update":
+        # Worldtree #204 / v0.28.0: persona-state observability event.
+        # status="current" carries full snapshot at turn start;
+        # status="scheduled" omits snapshot (lightweight post-appraisal-
+        # kickoff notification).
+        return AffectUpdate(
+            sse_id=sse_id,
+            status=body["status"],
+            turn_id=body["turn_id"],
+            snapshot=body.get("snapshot"),
+        )
    raise ValueError(f"unknown SSE event type: {t!r}")


@@ -309,6 +380,14 @@ async def _iter_events(
            # with a bad id is still a keepalive). Don't reorder.
            if sse.data == "":
                continue
+            # v0.8.1: empty-id frames are also treated as keepalives. Worldtree
+            # SOMETIMES emits events without an `id:` line (observed mid-stream
+            # on the qwen3.6-35-a3b-heretic provider, 2026-05-25). Per the SSE
+            # RFC, events without ids are legitimate (they just don't update
+            # Last-Event-ID); the previous strict behavior crashed every turn
+            # on the offending agent. Treat same as empty-data: skip silently.
+            if sse.id == "":
+                continue
            try:
                sse_id = _parse_sse_id(sse.id)
            except ValueError as exc:
@@ -309,6 +309,11 @@ def _resolve_auth(ns: argparse.Namespace) -> tuple[str, str]:
 async def _run_define(ns: argparse.Namespace) -> int:
    api_key, server_url = _resolve_auth(ns)
    from ratatoskr.cli import USER_AGENT
+    from ratatoskr.local_agents import (
+        LocalAgentEntry,
+        add_local_agent,
+        make_description,
+    )

    async with httpx.AsyncClient(
        base_url=server_url,
@@ -324,6 +329,16 @@ async def _run_define(ns: argparse.Namespace) -> int:
            system_prompt=ns.system_prompt,
            model=ns.model,
        )
+        # v0.8.0: persist to local index so the picker can show it.
+        add_local_agent(
+            LocalAgentEntry(
+                agent_id=info.agent_id,
+                agent_name=info.agent_name,
+                model=info.model,
+                description=make_description(info.system_prompt),
+                defined_at=info.created_at,
+            )
+        )
        print(f"defined {info.agent_id} ({info.model})")
        return 0

@@ -331,6 +346,11 @@ async def _run_define(ns: argparse.Namespace) -> int:
 async def _run_patch(ns: argparse.Namespace) -> int:
    api_key, server_url = _resolve_auth(ns)
    from ratatoskr.cli import USER_AGENT
+    from ratatoskr.local_agents import (
+        LocalAgentEntry,
+        make_description,
+        update_local_agent,
+    )

    if ns.system_prompt is None and ns.model is None:
        raise _Tier3UsageError(
@@ -350,6 +370,16 @@ async def _run_patch(ns: argparse.Namespace) -> int:
            system_prompt=ns.system_prompt,
            model=ns.model,
        )
+        # v0.8.0: refresh local index with the post-patch state.
+        update_local_agent(
+            LocalAgentEntry(
+                agent_id=info.agent_id,
+                agent_name=info.agent_name,
+                model=info.model,
+                description=make_description(info.system_prompt),
+                defined_at=info.updated_at,
+            )
+        )
        print(f"patched {info.agent_id}")
        return 0

@@ -357,6 +387,7 @@ async def _run_patch(ns: argparse.Namespace) -> int:
 async def _run_delete(ns: argparse.Namespace) -> int:
    api_key, server_url = _resolve_auth(ns)
    from ratatoskr.cli import USER_AGENT
+    from ratatoskr.local_agents import remove_local_agent

    async with httpx.AsyncClient(
        base_url=server_url,
@@ -367,6 +398,8 @@ async def _run_delete(ns: argparse.Namespace) -> int:
        timeout=httpx.Timeout(connect=10.0, read=30.0, write=10.0, pool=10.0),
    ) as client:
        await delete_agent(client, ns.agent_id)
+        # v0.8.0: drop from local index so the picker stops listing it.
+        remove_local_agent(ns.agent_id)
        print(f"deleted {ns.agent_id}")
        return 0

@@ -0,0 +1,8 @@
+"""ratatoskr.web — browser debug companion to the Ratatoskr TUI.
+
+Per issue #16 INV-001: this module MUST NOT import starlette or
+uvicorn at module top. Both live behind the optional `[web]` extras
+group; importing them eagerly here would defeat the lazy-import
+discipline that gives users without the extras a clean install hint
+instead of a naked ImportError.
+"""
@@ -0,0 +1,111 @@
+"""Console-script entrypoint for `ratatoskr-web`.
+
+Per docs/contracts/issues/16.contract.md FN main and INV-001:
+- MUST NOT import starlette / uvicorn at module top
+- Imports happen INSIDE main() after argparse, with ImportError caught
+  and converted to a clean `pip install ratatoskr[web]` exit
+- Users without the [web] extras installed get a readable hint instead
+  of a naked ImportError traceback
+"""
+
+from __future__ import annotations
+
+import argparse
+import os
+import sys
+import webbrowser
+from importlib.metadata import version as _pkg_version
+
+
+def _build_arg_parser() -> argparse.ArgumentParser:
+    p = argparse.ArgumentParser(
+        prog="ratatoskr-web",
+        description="Browser-based debug companion to ratatoskr.",
+    )
+    p.add_argument(
+        "--host", default="0.0.0.0",
+        help="Bind address. Default: 0.0.0.0 (LAN-accessible). "
+             "Use 127.0.0.1 to restrict to localhost.",
+    )
+    p.add_argument(
+        "--port", type=int, default=8765,
+        help="Listen port. Default 8765. Use 0 for random free.",
+    )
+    p.add_argument(
+        "--open", action="store_true",
+        help="Auto-open the URL in the system browser.",
+    )
+    return p
+
+
+def main(argv: list[str] | None = None) -> int:
+    """Console-script entry. Per FN main.
+
+    Returns:
+      0 on clean shutdown
+      11 on missing WORLDTREE_API_KEY ([auth_error])
+      12 on missing [web] extras ([missing_extras])
+    """
+    args = _build_arg_parser().parse_args(argv)
+
+    # Validate env BEFORE importing starlette so missing env shows the
+    # right error regardless of extras-install state.
+    api_key = os.environ.get("WORLDTREE_API_KEY")
+    if not api_key:
+        sys.stderr.write(
+            "[auth_error] WORLDTREE_API_KEY env var required. "
+            "Source env.sh in your project root.\n"
+        )
+        return 11
+    server_url = os.environ.get("WORLDTREE_API_URL", "http://localhost:8000")
+
+    # INV-001: lazy import. Users without [web] extras get a clean hint
+    # instead of a raw ImportError.
+    try:
+        import uvicorn
+
+        import httpx
+        from ratatoskr.cli import USER_AGENT
+        from ratatoskr.web.server import create_app
+    except ImportError as exc:
+        sys.stderr.write(
+            f"[missing_extras] {exc}\n"
+            f"ratatoskr-web requires the [web] optional dependencies.\n"
+            f"Install with: pip install ratatoskr[web]\n"
+        )
+        return 12
+
+    def client_factory() -> "httpx.AsyncClient":
+        return httpx.AsyncClient(
+            base_url=server_url,
+            headers={
+                "Authorization": f"Bearer {api_key}",
+                "User-Agent": USER_AGENT,
+            },
+            timeout=httpx.Timeout(connect=10.0, read=None, write=10.0, pool=10.0),
+        )
+
+    app = create_app(client_factory)
+
+    # Boot banner to stderr (so stdout stays clean for piping).
+    version = _pkg_version("ratatoskr")
+    host = args.host
+    port = args.port
+    display_host = "localhost" if host == "0.0.0.0" else host
+    sys.stderr.write(
+        f"ratatoskr-web v{version}\n"
+        f"Listening on http://{host}:{port}/\n"
+        f"Connect from this device: http://{display_host}:{port}/\n"
+    )
+    if host == "0.0.0.0":
+        sys.stderr.write(
+            f"Connect from LAN:        http://<host-ip>:{port}/\n"
+        )
+    sys.stderr.write("Ctrl-C to stop.\n")
+    sys.stderr.flush()
+
+    if args.open:
+        webbrowser.open(f"http://{display_host}:{port}/")
+
+    uvicorn.run(app, host=host, port=port, log_config=None)
+    return 0
@@ -0,0 +1,357 @@
+"""Starlette app factory + endpoint handlers for ratatoskr.web.
+
+Per docs/contracts/issues/16.contract.md. INV-002: create_app accepts
+a client_factory callable; the factory produces a configured
+httpx.AsyncClient. Tests pass a respx-mocked factory; production
+passes a factory that bakes in WORLDTREE_API_URL + WORLDTREE_API_KEY.
+"""
+
+from __future__ import annotations
+
+import asyncio
+import itertools
+import json
+from collections.abc import AsyncIterator, Callable
+from dataclasses import asdict, dataclass, field, is_dataclass
+from importlib.metadata import version as _pkg_version
+from typing import Any
+
+import httpx
+from starlette.applications import Starlette
+from starlette.requests import Request
+from starlette.responses import FileResponse, JSONResponse, StreamingResponse
+from starlette.routing import Mount, Route
+from starlette.staticfiles import StaticFiles
+
+from ratatoskr import local_agents as _local_agents
+from ratatoskr.sessions import (
+    AgentNotAvailable,
+    AgentNotFound,
+    AuthScopeDenied,
+    PersonaNotConfigured,
+    SessionApiFailed,
+    create_session,
+    get_persona_state,
+    list_agents,
+)
+from ratatoskr.sse_client import (
+    CancelAlreadyCompleted,
+    Cancelled,
+    CancelFailed,
+    CancelTurnNotFound,
+    Done,
+    Error,
+    MalformedSseData,
+    MalformedSseId,
+    SseConnectFailed,
+    SseConnectionDropped,
+    TurnIdFlip,
+    cancel_turn,
+    stream_turn,
+)
+
+
+def _static_dir() -> str:
+    """Locate the bundled static/ directory inside the installed package.
+
+    Uses importlib.resources so the lookup works for editable installs,
+    wheel installs, and uvicorn's worker reload. Per INV-009 packaging:
+    static/index.html ships in the wheel.
+    """
+    from importlib.resources import files
+    return str(files("ratatoskr.web") / "static")
+
+
+def _root_endpoint(request: Request) -> FileResponse:
+    """GET / → index.html. Per FN root_endpoint POST-001."""
+    from pathlib import Path
+    return FileResponse(
+        Path(_static_dir()) / "index.html",
+        media_type="text/html",
+    )
+
+
+def _version_endpoint(request: Request) -> JSONResponse:
+    """GET /version → {"ratatoskr": "<version>"}.
+
+    Per FN version_endpoint POST-001.
+    """
+    return JSONResponse({"ratatoskr": _pkg_version("ratatoskr")}, status_code=200)
+
+
+def _as_dict(obj: object) -> dict:
+    """Best-effort dataclass-to-dict for AgentInfo / LocalAgentEntry."""
+    if is_dataclass(obj):
+        return asdict(obj)
+    return dict(obj)  # type: ignore[arg-type]
+
+
+async def _agents_endpoint(request: Request) -> JSONResponse:
+    """GET /api/agents → upstream /agents + local Tier 3 index merge.
+
+    Per FN agents_endpoint POST-001 + ERRORS table.
+    """
+    client_factory = request.app.state.client_factory
+    try:
+        async with client_factory() as client:
+            upstream = await list_agents(client)
+    except SessionApiFailed as exc:
+        return JSONResponse(
+            {"error_code": "session_api_failed", "status": exc.status},
+            status_code=exc.status,
+        )
+    except httpx.RequestError as exc:
+        return JSONResponse(
+            {"error_code": "network_error", "message": str(exc)},
+            status_code=502,
+        )
+    upstream_ids = {a.agent_id for a in upstream}
+    local = _local_agents.load_local_agents()
+    merged = [_as_dict(a) for a in upstream] + [
+        _as_dict(le) for le in local if le.agent_id not in upstream_ids
+    ]
+    return JSONResponse(merged, status_code=200)
+
+
+async def _create_session_endpoint(request: Request) -> JSONResponse:
+    """POST /api/sessions → upstream POST /sessions. Per FN create_session_endpoint."""
+    body = await request.json()
+    agent_id = body.get("agent_id") if isinstance(body, dict) else None
+    if not agent_id:
+        return JSONResponse({"error_code": "missing_agent_id"}, status_code=400)
+    end_user_id = body.get("end_user_id") if isinstance(body, dict) else None
+    client_factory = request.app.state.client_factory
+    try:
+        async with client_factory() as client:
+            info = await create_session(client, agent_id, end_user_id=end_user_id)
+    except AgentNotFound:
+        return JSONResponse({"error_code": "agent_not_found"}, status_code=404)
+    except SessionApiFailed as exc:
+        return JSONResponse(
+            {"error_code": "session_api_failed", "status": exc.status},
+            status_code=exc.status,
+        )
+    return JSONResponse(_as_dict(info), status_code=201)
+
+
+@dataclass
+class TurnHandle:
+    """In-flight turn record stored in app.state.turn_registry.
+
+    Per FN submit_turn_endpoint + INV-005/006/007.
+    """
+
+    session_id: str
+    turn_id: int
+    content: str
+    status: str = "queued"  # queued | streaming | done | error | cancelled
+    upstream_response: Any = field(default=None, repr=False)
+
+
+# Process-local monotonic turn_id counter. Per FN submit_turn_endpoint
+# STEPS 2: turn_id is opaque to the upstream Worldtree (whose own
+# turn_ids come back via SSE); the registry's key uses our own counter
+# so cancel/stream lookups don't need upstream-issued ids.
+_TURN_COUNTER = itertools.count(1)
+
+
+async def _submit_turn_endpoint(request: Request) -> JSONResponse:
+    """POST /api/turns/{session_id} → allocate turn_id + register handle.
+
+    Per FN submit_turn_endpoint. Does NOT open the upstream stream here;
+    the subsequent GET /api/turns/{sid}/stream does that.
+    """
+    body = await request.json()
+    content = body.get("content") if isinstance(body, dict) else None
+    if not content:
+        return JSONResponse({"error_code": "missing_content"}, status_code=400)
+    session_id = request.path_params["session_id"]
+    turn_id = next(_TURN_COUNTER)
+    request.app.state.turn_registry[(session_id, turn_id)] = TurnHandle(
+        session_id=session_id, turn_id=turn_id, content=content,
+    )
+    return JSONResponse({"turn_id": turn_id}, status_code=200)
+
+
+def _event_to_browser_payload(event: object) -> tuple[str, dict]:
+    """Serialize an upstream Event dataclass to (browser_event_type, json_dict).
+
+    Per INV-008 + FN stream_turn_endpoint STEP 3. The dict shape is
+    locked by tests/fixtures/presentation_contract.json — one entry per
+    Event type. Implementation: snake_case class name as event_type;
+    asdict(event) with sse_id flattened to "T:S" string.
+    """
+    type_name = type(event).__name__
+    # CamelCase → snake_case
+    browser_type = "".join(
+        ("_" + c.lower() if c.isupper() and i else c.lower())
+        for i, c in enumerate(type_name)
+    )
+    data = asdict(event)  # type: ignore[arg-type]
+    sse_id = data.get("sse_id")
+    if isinstance(sse_id, (list, tuple)) and len(sse_id) == 2:
+        data["sse_id"] = f"{sse_id[0]}:{sse_id[1]}"
+    elif isinstance(sse_id, dict) and "turn_id" in sse_id and "seq" in sse_id:
+        data["sse_id"] = f"{sse_id['turn_id']}:{sse_id['seq']}"
+    return browser_type, data
+
+
+def _format_sse(event_type: str, data: dict) -> bytes:
+    """Format a browser-facing SSE event with `event:` + `data:`.
+
+    Two-newline terminator per the SSE spec.
+    """
+    return f"event: {event_type}\ndata: {json.dumps(data)}\n\n".encode()
+
+
+async def _stream_turn_endpoint(request: Request) -> StreamingResponse:
+    """GET /api/turns/{session_id}/stream?turn_id=N → proxy upstream SSE.
+
+    Per FN stream_turn_endpoint. Handles browser-disconnect cleanup
+    (INV-005) and synthesizes `event: error` for upstream typed
+    exceptions.
+    """
+    session_id = request.path_params["session_id"]
+    try:
+        turn_id = int(request.query_params["turn_id"])
+    except (KeyError, ValueError):
+        return JSONResponse({"error_code": "missing_turn_id"}, status_code=400)
+    registry = request.app.state.turn_registry
+    handle = registry.get((session_id, turn_id))
+    if handle is None:
+        return JSONResponse({"error_code": "turn_not_found"}, status_code=404)
+
+    client_factory = request.app.state.client_factory
+
+    async def gen() -> AsyncIterator[bytes]:
+        client = client_factory()
+        try:
+            handle.status = "streaming"
+            try:
+                async for event in stream_turn(client, session_id, handle.content):
+                    event_type, data = _event_to_browser_payload(event)
+                    yield _format_sse(event_type, data)
+                    if isinstance(event, (Done, Error, Cancelled)):
+                        handle.status = type(event).__name__.lower()
+                        break
+            except (SseConnectFailed, SseConnectionDropped, MalformedSseId,
+                    MalformedSseData, TurnIdFlip) as exc:
+                yield _format_sse(
+                    "error",
+                    {"exception": type(exc).__name__, "message": str(exc)},
+                )
+                handle.status = "error"
+            except asyncio.CancelledError:
+                # Browser disconnect path (INV-005).
+                if handle.status == "streaming":
+                    try:
+                        await cancel_turn(client, session_id, turn_id)
+                    except Exception:
+                        pass
+                raise
+        finally:
+            registry.pop((session_id, turn_id), None)
+            await client.aclose()
+
+    return StreamingResponse(gen(), media_type="text/event-stream")
+
+
+async def _cancel_turn_endpoint(request: Request) -> JSONResponse:
+    """POST /api/turns/{session_id}/cancel?turn_id=N. Per FN cancel_turn_endpoint."""
+    session_id = request.path_params["session_id"]
+    try:
+        turn_id = int(request.query_params["turn_id"])
+    except (KeyError, ValueError):
+        return JSONResponse({"error_code": "missing_turn_id"}, status_code=400)
+    registry = request.app.state.turn_registry
+    if (session_id, turn_id) not in registry:
+        return JSONResponse({"error_code": "turn_not_found"}, status_code=404)
+    client_factory = request.app.state.client_factory
+    try:
+        async with client_factory() as client:
+            await cancel_turn(client, session_id, turn_id)
+        body = {"cancelled": True}
+    except (CancelAlreadyCompleted, CancelTurnNotFound):
+        body = {"cancelled": False, "reason": "race_or_completed"}
+    except CancelFailed as exc:
+        registry.pop((session_id, turn_id), None)
+        return JSONResponse(
+            {"error_code": "cancel_failed", "status": exc.status},
+            status_code=exc.status,
+        )
+    registry.pop((session_id, turn_id), None)
+    return JSONResponse(body, status_code=200)
+
+
+async def _persona_state_endpoint(request: Request) -> JSONResponse:
+    """GET /api/agents/{agent_id}/persona_state. Per FN persona_state_endpoint."""
+    agent_id = request.path_params["agent_id"]
+    client_factory = request.app.state.client_factory
+    try:
+        async with client_factory() as client:
+            snap = await get_persona_state(client, agent_id)
+    except PersonaNotConfigured:
+        return JSONResponse({"error_code": "persona_not_configured"}, status_code=404)
+    except AgentNotAvailable:
+        return JSONResponse({"error_code": "agent_not_available"}, status_code=404)
+    except AuthScopeDenied:
+        return JSONResponse({"error_code": "auth_scope_denied"}, status_code=403)
+    return JSONResponse(snap, status_code=200)
+
+
+def create_app(client_factory: Callable[[], httpx.AsyncClient]) -> Starlette:
+    """Construct the Starlette app — wire routes + state per FN create_app.
+
+    INV-002: app MUST NOT construct httpx.AsyncClient at module top;
+    everything HTTP-bound goes through client_factory.
+    INV-006: lifespan shutdown drains the turn registry within a 5s
+    budget — every in-flight turn gets a best-effort upstream cancel.
+    """
+    assert callable(client_factory)
+
+    from contextlib import asynccontextmanager
+
+    @asynccontextmanager
+    async def lifespan(app: Starlette):
+        yield
+        # Shutdown path — drain in-flight turns per INV-006.
+        registry: dict[tuple[str, int], TurnHandle] = app.state.turn_registry
+        in_flight = [h for h in registry.values() if h.status == "streaming"]
+        if in_flight:
+            client = client_factory()
+            try:
+                tasks = [
+                    asyncio.create_task(
+                        cancel_turn(client, h.session_id, h.turn_id)
+                    )
+                    for h in in_flight
+                ]
+                done, pending = await asyncio.wait(tasks, timeout=5.0)
+                for task in pending:
+                    task.cancel()
+                # Log timeouts (stderr; observability per scope v2)
+                if pending:
+                    import sys as _sys
+                    _sys.stderr.write(
+                        f'{{"kind":"shutdown","event":"cleanup_timeout","count":{len(pending)}}}\n'
+                    )
+            finally:
+                await client.aclose()
+        registry.clear()
+
+    routes = [
+        Route("/", _root_endpoint),
+        Mount("/static", app=StaticFiles(directory=_static_dir()), name="static"),
+        Route("/version", _version_endpoint),
+        Route("/api/agents", _agents_endpoint),
+        Route("/api/sessions", _create_session_endpoint, methods=["POST"]),
+        Route("/api/agents/{agent_id}/persona_state", _persona_state_endpoint),
+        Route("/api/turns/{session_id}", _submit_turn_endpoint, methods=["POST"]),
+        Route("/api/turns/{session_id}/stream", _stream_turn_endpoint),
+        Route("/api/turns/{session_id}/cancel", _cancel_turn_endpoint, methods=["POST"]),
+    ]
+    app = Starlette(routes=routes, lifespan=lifespan)
+    app.state.client_factory = client_factory
+    # INV-002: turn registry is in-process memory, keyed (session_id, turn_id)
+    app.state.turn_registry = {}
+    return app
@@ -0,0 +1,445 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="UTF-8" />
+<title>ratatoskr</title>
+<style>
+  :root {
+    --bg: #000000;
+    --surface: #373b46;
+    --panel: #414751;
+    --fg: #a9bcc3;
+    --dark-50: #6e7882;
+    --dark-60: #86929d;
+    --bright-70: #9daeb6;
+    --bright-cyan: #42dcd1;
+    --bright-blue: #a4c4ff;
+    --aurora-green: #16B866;
+    --dawn-red: #ff491a;
+    --dawn-yellow: #e1c631;
+  }
+  * { box-sizing: border-box; }
+  html, body { margin: 0; padding: 0; height: 100%; }
+  body {
+    font-family: ui-monospace, "SF Mono", Menlo, monospace;
+    font-size: 13px;
+    background: var(--bg);
+    color: var(--fg);
+    display: flex; flex-direction: column;
+  }
+  #persona-header {
+    flex: 0 0 auto;
+    height: 24px; padding: 4px 12px;
+    background: var(--surface); color: var(--bright-70);
+    display: none;
+  }
+  #persona-header.show { display: flex; align-items: center; }
+  #main {
+    flex: 1 1 auto;
+    display: grid;
+    grid-template-columns: 2fr 1fr;
+    overflow: hidden;
+  }
+  #left, #right { display: flex; flex-direction: column; overflow: hidden; }
+  #left { border-right: 1px solid var(--panel); }
+  #transcript { flex: 1 1 auto; overflow-y: auto; padding: 8px 12px; }
+  #transcript .turn-header { color: var(--dark-60); padding: 4px 0; }
+  #transcript .prompt-echo { color: var(--bright-cyan); font-weight: bold; padding: 4px 0; }
+  #transcript .response { white-space: pre-wrap; padding: 4px 0; }
+  #transcript .done-label { color: var(--aurora-green); padding: 4px 0; }
+  #transcript .error-label { color: var(--dawn-red); padding: 4px 0; }
+  #transcript .cancelled-label { color: var(--dawn-yellow); padding: 4px 0; }
+  #transcript .awaiting { color: var(--dark-60); padding: 4px 0; font-style: italic; }
+  #prompt-row {
+    flex: 0 0 auto;
+    padding: 8px 12px; border-top: 1px solid var(--panel);
+  }
+  #prompt-input {
+    width: 100%;
+    background: transparent; color: var(--fg);
+    border: 1px solid var(--dark-50); padding: 6px 8px;
+    font-family: inherit; font-size: inherit;
+  }
+  #right .tabs {
+    flex: 0 0 auto;
+    display: flex; gap: 4px; padding: 4px 8px;
+    border-bottom: 1px solid var(--panel);
+  }
+  #right .tab {
+    padding: 4px 12px; cursor: pointer;
+    color: var(--dark-60); user-select: none;
+  }
+  #right .tab.active { color: var(--bright-cyan); border-bottom: 2px solid var(--bright-cyan); }
+  #right .pane {
+    flex: 1 1 auto;
+    overflow-y: auto; padding: 8px 12px;
+    white-space: pre-wrap; word-break: break-word;
+    display: none;
+  }
+  #right .pane.active { display: block; }
+  #right .pane-actions {
+    padding: 4px 12px; border-top: 1px solid var(--panel);
+    display: flex; justify-content: flex-end;
+  }
+  #right .copy-btn {
+    background: transparent; color: var(--dark-60);
+    border: 1px solid var(--dark-50); padding: 2px 8px;
+    cursor: pointer; font-family: inherit; font-size: 11px;
+  }
+  #footer {
+    flex: 0 0 auto;
+    padding: 4px 12px; border-top: 1px solid var(--panel);
+    color: var(--dark-60); font-size: 11px;
+    display: flex; justify-content: space-between;
+  }
+  #setup {
+    flex: 1 1 auto; padding: 32px;
+    display: flex; flex-direction: column; gap: 12px;
+  }
+  #setup select { padding: 4px 8px; background: var(--surface); color: var(--fg); border: 1px solid var(--panel); }
+  #setup button { padding: 6px 14px; background: var(--bright-cyan); color: var(--bg); border: 0; cursor: pointer; }
+</style>
+</head>
+<body>
+<div id="persona-header"></div>
+<div id="setup">
+  <h2 style="color: var(--bright-cyan); margin: 0;">ratatoskr-web</h2>
+  <p>Internal LAN debug surface. Pick an agent and start a session.</p>
+  <label>Agent:
+    <select id="agent-picker"></select>
+  </label>
+  <button id="start-btn">Start new session</button>
+</div>
+<div id="main" style="display: none;">
+  <div id="left">
+    <div id="transcript"></div>
+    <div id="prompt-row">
+      <input id="prompt-input" type="text"
+             placeholder="Type a message and press Enter (Ctrl-C cancels in-flight)" autofocus />
+    </div>
+  </div>
+  <div id="right">
+    <div class="tabs">
+      <div class="tab active" data-pane="tools">Tools</div>
+      <div class="tab" data-pane="debug">Debug</div>
+      <div class="tab" data-pane="thinking">Thinking</div>
+      <div class="tab" data-pane="persona">Persona</div>
+    </div>
+    <div class="pane active" id="pane-tools"></div>
+    <div class="pane" id="pane-debug"></div>
+    <div class="pane" id="pane-thinking"></div>
+    <div class="pane" id="pane-persona"></div>
+    <div class="pane-actions">
+      <button class="copy-btn" id="copy-btn">copy pane</button>
+    </div>
+  </div>
+</div>
+<div id="footer">
+  <span id="identity">—</span>
+  <span id="version">ratatoskr —</span>
+</div>
+<script>
+// ratatoskr-web — vanilla JS client.
+// Five-pane debug surface; HTML-escapes assistant content (INV-004).
+// Drift-detection contract: tests/fixtures/presentation_contract.json
+"use strict";
+
+const $ = (id) => document.getElementById(id);
+const state = {
+  sessionId: null,
+  agentId: null,
+  turnId: null,
+  eventSource: null,
+};
+
+function esc(s) {
+  const d = document.createElement("div");
+  d.appendChild(document.createTextNode(String(s)));
+  return d.innerHTML;
+}
+
+function appendTo(paneId, html) {
+  const el = $(paneId);
+  el.insertAdjacentHTML("beforeend", html);
+  el.scrollTop = el.scrollHeight;
+}
+
+function ts() {
+  const d = new Date();
+  return d.toTimeString().slice(0, 8) + "." + String(d.getMilliseconds()).padStart(3, "0");
+}
+
+async function loadAgents() {
+  const r = await fetch("/api/agents");
+  const agents = await r.json();
+  const picker = $("agent-picker");
+  for (const a of agents) {
+    const opt = document.createElement("option");
+    opt.value = a.agent_id;
+    opt.textContent = a.agent_id + (a.name ? " · " + a.name : "");
+    picker.appendChild(opt);
+  }
+}
+
+async function loadVersion() {
+  try {
+    const r = await fetch("/version");
+    const v = await r.json();
+    $("version").textContent = "ratatoskr " + v.ratatoskr;
+  } catch (_) {}
+}
+
+async function loadPersona(agentId) {
+  try {
+    const r = await fetch("/api/agents/" + encodeURIComponent(agentId) + "/persona_state");
+    if (r.status === 200) {
+      const snap = await r.json();
+      renderPersona(snap);
+      $("persona-header").classList.add("show");
+      $("persona-header").textContent =
+        snap.agent_id + " · " + (snap.dominant_emotion || "?") +
+        " · pad(" + (snap.pad?.pleasure ?? "?") + ", " +
+        (snap.pad?.arousal ?? "?") + ", " +
+        (snap.pad?.dominance ?? "?") + ")";
+    } else {
+      appendTo("pane-persona",
+        '<div class="awaiting">(persona not available: ' + esc(r.status) + ')</div>');
+    }
+  } catch (e) {
+    appendTo("pane-persona", '<div class="awaiting">(persona fetch failed)</div>');
+  }
+}
+
+function renderPersona(snap) {
+  const html = "Persona snapshot · " + esc(snap.agent_id) + "\n\n" +
+    "Dominant emotion: " + esc(snap.dominant_emotion || "?") + "\n\n" +
+    "PAD: " + JSON.stringify(snap.pad) + "\n" +
+    "Baseline: " + JSON.stringify(snap.baseline_pad || {}) + "\n" +
+    "Mood drift: " + JSON.stringify(snap.mood_drift || {}) + "\n\n" +
+    "Active emotions: " + JSON.stringify(snap.emotions_active || []) + "\n\n" +
+    "Last updated: " + esc(snap.last_updated_at || "?");
+  $("pane-persona").textContent = html;
+}
+
+async function startSession() {
+  const agentId = $("agent-picker").value;
+  if (!agentId) return;
+  state.agentId = agentId;
+  const r = await fetch("/api/sessions", {
+    method: "POST",
+    headers: {"Content-Type": "application/json"},
+    body: JSON.stringify({agent_id: agentId, end_user_id: "ratatoskr-web"}),
+  });
+  if (r.status !== 201) {
+    alert("create session failed: " + r.status);
+    return;
+  }
+  const info = await r.json();
+  state.sessionId = info.session_id;
+  $("identity").textContent = agentId + " · …" + info.session_id.slice(-8);
+  $("setup").style.display = "none";
+  $("main").style.display = "grid";
+  await loadPersona(agentId);
+  $("prompt-input").focus();
+}
+
+function clearPanes() {
+  $("pane-tools").innerHTML = "";
+  $("pane-debug").innerHTML = "";
+  $("pane-thinking").innerHTML = "";
+}
+
+function appendTranscriptResponse(text) {
+  // INV-004: transcript content is HTML-escaped (model output is untrusted).
+  let bubble = document.querySelector("#transcript .response.live");
+  if (!bubble) {
+    bubble = document.createElement("div");
+    bubble.className = "response live";
+    $("transcript").appendChild(bubble);
+  }
+  bubble.textContent += text;
+  $("transcript").scrollTop = $("transcript").scrollHeight;
+}
+
+function finalizeResponse() {
+  const live = document.querySelector("#transcript .response.live");
+  if (live) live.classList.remove("live");
+}
+
+async function submitPrompt() {
+  const input = $("prompt-input");
+  const content = input.value.trim();
+  if (!content || !state.sessionId) return;
+  input.value = "";
+
+  // Echo prompt
+  const echo = document.createElement("div");
+  echo.className = "prompt-echo";
+  echo.textContent = "❯ " + content;
+  $("transcript").appendChild(echo);
+
+  // Submit POST → turn_id
+  const r = await fetch("/api/turns/" + encodeURIComponent(state.sessionId), {
+    method: "POST",
+    headers: {"Content-Type": "application/json"},
+    body: JSON.stringify({content}),
+  });
+  if (r.status !== 200) {
+    appendTo("pane-debug",
+      '<div>[' + ts() + '] submit_failed status=' + r.status + '</div>');
+    return;
+  }
+  const {turn_id} = await r.json();
+  state.turnId = turn_id;
+
+  // Turn-header divider in transcript
+  const head = document.createElement("div");
+  head.className = "turn-header";
+  head.textContent = "── turn " + turn_id + " ──";
+  $("transcript").appendChild(head);
+
+  // Open SSE stream
+  const url = "/api/turns/" + encodeURIComponent(state.sessionId) +
+              "/stream?turn_id=" + turn_id;
+  const es = new EventSource(url);
+  state.eventSource = es;
+  let textDeltas = 0, thinkingDeltas = 0, heartbeats = 0;
+  const turnStart = Date.now();
+
+  function audit(line) {
+    appendTo("pane-debug", "<div>[" + ts() + "] " + esc(line) + "</div>");
+  }
+
+  audit("turn_open turn_id=" + turn_id);
+
+  es.addEventListener("worker_phase", (e) => {
+    const d = JSON.parse(e.data);
+    audit("worker_phase phase=" + d.phase + " turn_id=" + d.turn_id);
+  });
+  es.addEventListener("thinking", (e) => {
+    const d = JSON.parse(e.data);
+    thinkingDeltas += 1;
+    appendTo("pane-thinking", esc(d.content));
+  });
+  es.addEventListener("text", (e) => {
+    const d = JSON.parse(e.data);
+    textDeltas += 1;
+    appendTranscriptResponse(d.content);
+  });
+  es.addEventListener("text_boundary", (e) => {
+    const d = JSON.parse(e.data);
+    audit("text_boundary kind=" + d.kind + " offset=" + d.char_offset);
+  });
+  es.addEventListener("tool_start", (e) => {
+    const d = JSON.parse(e.data);
+    appendTo("pane-tools",
+      "<div>· tool_start name=" + esc(d.name) + " args=" + esc(JSON.stringify(d.arguments)) + "</div>");
+  });
+  es.addEventListener("tool_result", (e) => {
+    const d = JSON.parse(e.data);
+    appendTo("pane-tools",
+      "<div>· tool_result name=" + esc(d.name) + " duration_ms=" + d.duration_ms + "</div>");
+  });
+  es.addEventListener("awaiting_llm_first_token", (e) => {
+    const d = JSON.parse(e.data);
+    heartbeats += 1;
+    let el = document.querySelector("#transcript .awaiting.live");
+    if (!el) {
+      el = document.createElement("div");
+      el.className = "awaiting live";
+      $("transcript").appendChild(el);
+    }
+    el.textContent = "awaiting first token · " +
+      (d.elapsed_ms_since_building_prompt / 1000).toFixed(1) + "s";
+  });
+  es.addEventListener("affect_update", (e) => {
+    const d = JSON.parse(e.data);
+    audit("affect_update status=" + d.status + " turn_id=" + d.turn_id);
+    if (d.status === "current" && d.snapshot) {
+      renderPersona(d.snapshot);
+      $("persona-header").classList.add("show");
+      $("persona-header").textContent =
+        d.snapshot.agent_id + " · " + (d.snapshot.dominant_emotion || "?") +
+        " · pad(" + (d.snapshot.pad?.pleasure ?? "?") + ", " +
+        (d.snapshot.pad?.arousal ?? "?") + ", " +
+        (d.snapshot.pad?.dominance ?? "?") + ")";
+    }
+  });
+  function terminal(label, cls, e) {
+    // Remove the awaiting indicator if it's still showing
+    const aw = document.querySelector("#transcript .awaiting.live");
+    if (aw) aw.remove();
+    finalizeResponse();
+    const div = document.createElement("div");
+    div.className = cls;
+    div.textContent = "[" + label + "] " + (e ? e.data : "");
+    $("transcript").appendChild(div);
+    const elapsed = Math.round((Date.now() - turnStart) / 100) / 10;
+    audit("turn_summary turn_id=" + turn_id +
+          " text_deltas=" + textDeltas +
+          " thinking_deltas=" + thinkingDeltas +
+          " heartbeats=" + heartbeats +
+          " elapsed_s=" + elapsed);
+    es.close();
+    state.eventSource = null;
+    state.turnId = null;
+  }
+  es.addEventListener("done", (e) => terminal("done", "done-label", e));
+  es.addEventListener("error", (e) => terminal("error", "error-label", e));
+  es.addEventListener("cancelled", (e) => terminal("cancelled", "cancelled-label", e));
+  es.onerror = () => {
+    // Connection lost — log to debug, don't terminate transcript with a label
+    audit("sse_connection_dropped turn_id=" + turn_id);
+    es.close();
+    state.eventSource = null;
+  };
+}
+
+async function cancelTurn() {
+  if (!state.sessionId || !state.turnId) return;
+  await fetch("/api/turns/" + encodeURIComponent(state.sessionId) +
+              "/cancel?turn_id=" + state.turnId, {method: "POST"});
+}
+
+// Tab switching
+document.querySelectorAll("#right .tab").forEach((t) => {
+  t.addEventListener("click", () => {
+    document.querySelectorAll("#right .tab").forEach((x) => x.classList.remove("active"));
+    document.querySelectorAll("#right .pane").forEach((x) => x.classList.remove("active"));
+    t.classList.add("active");
+    $("pane-" + t.dataset.pane).classList.add("active");
+  });
+});
+
+// Ctrl+1..4 tab shortcuts (matches TUI)
+document.addEventListener("keydown", (e) => {
+  if (e.ctrlKey && ["1", "2", "3", "4"].includes(e.key)) {
+    const idx = parseInt(e.key, 10) - 1;
+    const tabs = document.querySelectorAll("#right .tab");
+    if (tabs[idx]) { tabs[idx].click(); e.preventDefault(); }
+  }
+  // Ctrl-C cancels in-flight turn
+  if (e.ctrlKey && e.key === "c" && state.turnId) {
+    cancelTurn(); e.preventDefault();
+  }
+});
+
+// Copy active pane to clipboard
+$("copy-btn").addEventListener("click", () => {
+  const active = document.querySelector("#right .pane.active");
+  if (active) navigator.clipboard.writeText(active.textContent || "");
+});
+
+$("start-btn").addEventListener("click", startSession);
+$("prompt-input").addEventListener("keydown", (e) => {
+  if (e.key === "Enter" && !e.shiftKey) {
+    e.preventDefault();
+    submitPrompt();
+  }
+});
+
+loadAgents();
+loadVersion();
+</script>
+</body>
+</html>
@@ -0,0 +1,125 @@
+{
+  "_contract_version": "0.15.0",
+  "_provenance": "Issue #16 INV-008 — server-side proxy serialization shape. One entry per Event type defined in ratatoskr.sse_client. The JS presenter in static/index.html renders against the `data` shape; if either side changes, both must update in lockstep.",
+
+  "worker_phase": {
+    "event_type": "worker_phase",
+    "data": {
+      "sse_id": "42:3",
+      "phase": "BuildingPrompt",
+      "turn_id": 42
+    }
+  },
+
+  "thinking": {
+    "event_type": "thinking",
+    "data": {
+      "sse_id": "42:5",
+      "content": "Let me think..."
+    }
+  },
+
+  "text": {
+    "event_type": "text",
+    "data": {
+      "sse_id": "42:7",
+      "content": "Hello there"
+    }
+  },
+
+  "text_boundary": {
+    "event_type": "text_boundary",
+    "data": {
+      "sse_id": "42:8",
+      "kind": "sentence",
+      "char_offset": 11,
+      "ts": "2026-05-28T00:00:00Z"
+    }
+  },
+
+  "tool_start": {
+    "event_type": "tool_start",
+    "data": {
+      "sse_id": "42:9",
+      "name": "search",
+      "arguments": {"q": "ratatoskr"}
+    }
+  },
+
+  "tool_result": {
+    "event_type": "tool_result",
+    "data": {
+      "sse_id": "42:10",
+      "name": "search",
+      "result": {"n": 1},
+      "duration_ms": 12
+    }
+  },
+
+  "done": {
+    "event_type": "done",
+    "data": {
+      "sse_id": "42:11",
+      "phase": "succeeded",
+      "response": "Hello there",
+      "model": "qwen3.6-35-a3b",
+      "duration_ms": 1234,
+      "usage": {
+        "prompt_tokens": 100,
+        "completion_tokens": 50,
+        "total_tokens": 150,
+        "cached_input_tokens": 0
+      }
+    }
+  },
+
+  "error": {
+    "event_type": "error",
+    "data": {
+      "sse_id": "42:11",
+      "phase": "failed",
+      "message": "llm output invalid",
+      "error_code": "llm_output_invalid"
+    }
+  },
+
+  "cancelled": {
+    "event_type": "cancelled",
+    "data": {
+      "sse_id": "42:11",
+      "phase": "cancelled",
+      "turn_id": 42,
+      "reason": "user_cancel",
+      "partial_message_id": null
+    }
+  },
+
+  "affect_update": {
+    "event_type": "affect_update",
+    "data": {
+      "sse_id": "42:1",
+      "status": "current",
+      "turn_id": 42,
+      "snapshot": {
+        "agent_id": "mimir",
+        "pad": {"pleasure": 0.52, "arousal": 0.47, "dominance": 0.50},
+        "dominant_emotion": "curiosity",
+        "emotions_active": [
+          {"type": "curiosity", "intensity": 0.6, "decay_remaining_s": 202.7}
+        ],
+        "baseline_pad": {"pleasure": 0.50, "arousal": 0.40, "dominance": 0.50},
+        "mood_drift": {"valence_delta": 0.02, "arousal_delta": 0.07},
+        "last_updated_at": "2026-05-28T00:00:00+00:00"
+      }
+    }
+  },
+
+  "awaiting_llm_first_token": {
+    "event_type": "awaiting_llm_first_token",
+    "data": {
+      "sse_id": "42:2",
+      "turn_id": 42,
+      "elapsed_ms_since_building_prompt": 5012.3
+    }
+  }
+}
@@ -0,0 +1,187 @@
+"""Tests for ratatoskr.local_agents.
+
+Use ``$RATATOSKR_LOCAL_AGENTS`` env-var override + pytest tmp_path to
+isolate from the operator's real ``~/.config/ratatoskr/local_agents.json``.
+"""
+
+from __future__ import annotations
+
+import json
+from pathlib import Path
+
+import pytest
+
+from ratatoskr.local_agents import (
+    LocalAgentEntry,
+    _local_agents_path,
+    add_local_agent,
+    load_local_agents,
+    make_description,
+    remove_local_agent,
+    update_local_agent,
+)
+
+
+@pytest.fixture
+def local_path(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> Path:
+    """Point $RATATOSKR_LOCAL_AGENTS at a fresh tmp file for the test."""
+    path = tmp_path / "local_agents.json"
+    monkeypatch.setenv("RATATOSKR_LOCAL_AGENTS", str(path))
+    return path
+
+
+def _entry(
+    agent_id: str = "ratatoskr:wizard",
+    agent_name: str = "wizard",
+    model: str = "qwen3.6-35-a3b",
+    description: str = "(tier 3) test agent",
+    defined_at: str = "2026-05-25T00:00:00+00:00",
+) -> LocalAgentEntry:
+    return LocalAgentEntry(
+        agent_id=agent_id,
+        agent_name=agent_name,
+        model=model,
+        description=description,
+        defined_at=defined_at,
+    )
+
+
+class TestPathResolution:
+    def test_env_override(self, monkeypatch: pytest.MonkeyPatch) -> None:
+        monkeypatch.setenv("RATATOSKR_LOCAL_AGENTS", "/tmp/custom-agents.json")
+        assert _local_agents_path() == Path("/tmp/custom-agents.json")
+
+    def test_xdg_config_home(self, monkeypatch: pytest.MonkeyPatch) -> None:
+        monkeypatch.delenv("RATATOSKR_LOCAL_AGENTS", raising=False)
+        monkeypatch.setenv("XDG_CONFIG_HOME", "/tmp/xdg-config")
+        assert (
+            _local_agents_path()
+            == Path("/tmp/xdg-config/ratatoskr/local_agents.json")
+        )
+
+    def test_default_home(self, monkeypatch: pytest.MonkeyPatch) -> None:
+        monkeypatch.delenv("RATATOSKR_LOCAL_AGENTS", raising=False)
+        monkeypatch.delenv("XDG_CONFIG_HOME", raising=False)
+        path = _local_agents_path()
+        assert path == Path.home() / ".config" / "ratatoskr" / "local_agents.json"
+
+
+class TestLoadEmpty:
+    def test_missing_file_returns_empty(self, local_path: Path) -> None:
+        assert not local_path.exists()
+        assert load_local_agents() == []
+
+    def test_corrupt_json_returns_empty(self, local_path: Path) -> None:
+        local_path.parent.mkdir(parents=True, exist_ok=True)
+        local_path.write_text("not json at all")
+        assert load_local_agents() == []
+
+    def test_wrong_schema_version_returns_empty(self, local_path: Path) -> None:
+        local_path.parent.mkdir(parents=True, exist_ok=True)
+        local_path.write_text(json.dumps({"version": 999, "agents": []}))
+        assert load_local_agents() == []
+
+    def test_missing_version_key_returns_empty(self, local_path: Path) -> None:
+        local_path.parent.mkdir(parents=True, exist_ok=True)
+        local_path.write_text(json.dumps({"agents": []}))
+        assert load_local_agents() == []
+
+    def test_malformed_row_skipped(self, local_path: Path) -> None:
+        local_path.parent.mkdir(parents=True, exist_ok=True)
+        local_path.write_text(
+            json.dumps(
+                {
+                    "version": 1,
+                    "agents": [
+                        {"agent_id": "incomplete"},  # missing required fields
+                        {
+                            "agent_id": "ratatoskr:good",
+                            "agent_name": "good",
+                            "model": "m",
+                            "description": "d",
+                            "defined_at": "t",
+                        },
+                    ],
+                }
+            )
+        )
+        entries = load_local_agents()
+        assert len(entries) == 1
+        assert entries[0].agent_id == "ratatoskr:good"
+
+
+class TestAdd:
+    def test_add_one(self, local_path: Path) -> None:
+        add_local_agent(_entry())
+        entries = load_local_agents()
+        assert len(entries) == 1
+        assert entries[0].agent_id == "ratatoskr:wizard"
+
+    def test_add_two_different(self, local_path: Path) -> None:
+        add_local_agent(_entry(agent_id="ratatoskr:a", agent_name="a"))
+        add_local_agent(_entry(agent_id="ratatoskr:b", agent_name="b"))
+        ids = {e.agent_id for e in load_local_agents()}
+        assert ids == {"ratatoskr:a", "ratatoskr:b"}
+
+    def test_add_replaces_same_id(self, local_path: Path) -> None:
+        add_local_agent(_entry(model="old-model"))
+        add_local_agent(_entry(model="new-model"))
+        entries = load_local_agents()
+        assert len(entries) == 1
+        assert entries[0].model == "new-model"
+
+    def test_creates_parent_dirs(
+        self, tmp_path: Path, monkeypatch: pytest.MonkeyPatch
+    ) -> None:
+        nested = tmp_path / "deep" / "nested" / "path" / "agents.json"
+        monkeypatch.setenv("RATATOSKR_LOCAL_AGENTS", str(nested))
+        add_local_agent(_entry())
+        assert nested.exists()
+
+
+class TestUpdate:
+    def test_update_changes_existing(self, local_path: Path) -> None:
+        add_local_agent(_entry(model="v1"))
+        update_local_agent(_entry(model="v2"))
+        entries = load_local_agents()
+        assert len(entries) == 1
+        assert entries[0].model == "v2"
+
+
+class TestRemove:
+    def test_remove_existing(self, local_path: Path) -> None:
+        add_local_agent(_entry())
+        remove_local_agent("ratatoskr:wizard")
+        assert load_local_agents() == []
+
+    def test_remove_missing_is_noop(self, local_path: Path) -> None:
+        add_local_agent(_entry())
+        remove_local_agent("ratatoskr:doesnotexist")
+        assert len(load_local_agents()) == 1
+
+
+class TestMakeDescription:
+    def test_first_nonempty_line(self) -> None:
+        prompt = "\n\n# IDENTITY\nYou are a test agent..."
+        desc = make_description(prompt)
+        assert desc.startswith("(tier 3) IDENTITY")
+
+    def test_strips_heading_markers(self) -> None:
+        prompt = "# A nice heading\nMore prompt..."
+        desc = make_description(prompt)
+        assert "(tier 3) A nice heading" == desc
+
+    def test_truncates_long(self) -> None:
+        prompt = "x" * 200
+        desc = make_description(prompt)
+        # 80 char cap including the prefix
+        assert len(desc) == 81  # 80 + ellipsis char
+        assert desc.endswith("…")
+
+    def test_empty_prompt_fallback(self) -> None:
+        desc = make_description("")
+        assert desc == "(tier 3) custom system prompt"
+
+    def test_whitespace_only_fallback(self) -> None:
+        desc = make_description("   \n\n  ")
+        assert desc == "(tier 3) custom system prompt"
@@ -6,11 +6,15 @@ import respx

 from ratatoskr.sessions import (
    AgentInfo,
+    AgentNotAvailable,
    AgentNotFound,
+    AuthScopeDenied,
    InvalidCursor,
+    PersonaNotConfigured,
    SessionApiFailed,
    SessionPage,
    create_session,
+    get_persona_state,
    list_agents,
    list_sessions,
 )
@@ -556,3 +560,108 @@ class TestListAgents:
            with pytest.raises(SessionApiFailed) as excinfo:
                await list_agents(client)
        assert excinfo.value.status == 401
+
+
+class TestGetPersonaState:
+    """Worldtree #204 / v0.28.0 — GET /agents/{agent_id}/persona_state.
+
+    Bootstrap read for the persona snapshot — same shape as `affect_update`'s
+    `current` snapshot. Auth via `persona.read` scope (user-tier default).
+    """
+
+    @respx.mock
+    async def test_happy_full_snapshot(self) -> None:
+        """happy_full_snapshot [happy,tracer]: 200 → snapshot dict with pad +
+        dominant_emotion + emotions_active + baseline_pad + mood_drift.
+        """
+        snapshot = {
+            "agent_id": "mimir",
+            "pad": {"pleasure": 0.52, "arousal": 0.47, "dominance": 0.50},
+            "dominant_emotion": "curiosity",
+            "emotions_active": [
+                {"type": "curiosity", "intensity": 0.6, "decay_remaining_s": 202.7}
+            ],
+            "baseline_pad": {"pleasure": 0.50, "arousal": 0.40, "dominance": 0.50},
+            "mood_drift": {"valence_delta": 0.02, "arousal_delta": 0.07},
+            "last_updated_at": "2026-05-25T22:30:18+00:00",
+        }
+        respx.get("https://w.example/agents/mimir/persona_state").mock(
+            return_value=httpx.Response(200, json=snapshot)
+        )
+        async with httpx.AsyncClient(base_url="https://w.example") as client:
+            result = await get_persona_state(client, "mimir")
+        assert result == snapshot
+
+    @respx.mock
+    async def test_persona_not_configured_404(self) -> None:
+        """persona_not_configured_404 [error]: 404 with error_code
+        persona_not_configured → PersonaNotConfigured. Agent exists but has
+        no persona surface (e.g. domari, muninn, Tier 3).
+        """
+        respx.get("https://w.example/agents/domari/persona_state").mock(
+            return_value=httpx.Response(
+                404, json={"error_code": "persona_not_configured", "message": "no persona"}
+            )
+        )
+        async with httpx.AsyncClient(base_url="https://w.example") as client:
+            with pytest.raises(PersonaNotConfigured) as exc_info:
+                await get_persona_state(client, "domari")
+        assert exc_info.value.agent_id == "domari"
+
+    @respx.mock
+    async def test_agent_not_available_404(self) -> None:
+        """agent_not_available_404 [error]: 404 with error_code
+        agent_not_available → AgentNotAvailable. Distinct from
+        persona_not_configured — the agent_id itself is unknown.
+        """
+        respx.get("https://w.example/agents/bogus/persona_state").mock(
+            return_value=httpx.Response(
+                404, json={"error_code": "agent_not_available", "message": "unknown agent"}
+            )
+        )
+        async with httpx.AsyncClient(base_url="https://w.example") as client:
+            with pytest.raises(AgentNotAvailable) as exc_info:
+                await get_persona_state(client, "bogus")
+        assert exc_info.value.agent_id == "bogus"
+
+    @respx.mock
+    async def test_auth_scope_denied_403(self) -> None:
+        """auth_scope_denied_403 [error]: 403 with error_code auth_scope_denied
+        → AuthScopeDenied. Key lacks `persona.read` scope.
+        """
+        respx.get("https://w.example/agents/mimir/persona_state").mock(
+            return_value=httpx.Response(
+                403,
+                json={"error_code": "auth_scope_denied", "message": "missing persona.read"},
+            )
+        )
+        async with httpx.AsyncClient(base_url="https://w.example") as client:
+            with pytest.raises(AuthScopeDenied) as exc_info:
+                await get_persona_state(client, "mimir")
+        assert exc_info.value.scope == "persona.read"
+
+    @respx.mock
+    async def test_404_unknown_error_code_falls_through(self) -> None:
+        """404_unknown_error_code_falls_through [adversarial]: 404 without the
+        two known error codes → SessionApiFailed (don't swallow novel failure
+        modes as something more specific than they are).
+        """
+        respx.get("https://w.example/agents/mimir/persona_state").mock(
+            return_value=httpx.Response(404, json={"error_code": "novel_404"})
+        )
+        async with httpx.AsyncClient(base_url="https://w.example") as client:
+            with pytest.raises(SessionApiFailed) as exc_info:
+                await get_persona_state(client, "mimir")
+        assert exc_info.value.status == 404
+
+    @respx.mock
+    async def test_500_unexpected_status(self) -> None:
+        """500_unexpected_status [error]: 5xx → SessionApiFailed (matches the
+        list_agents / list_sessions / create_session precedent)."""
+        respx.get("https://w.example/agents/mimir/persona_state").mock(
+            return_value=httpx.Response(500, content=b"boom")
+        )
+        async with httpx.AsyncClient(base_url="https://w.example") as client:
+            with pytest.raises(SessionApiFailed) as exc_info:
+                await get_persona_state(client, "mimir")
+        assert exc_info.value.status == 500
@@ -5,6 +5,8 @@ import pytest
 import respx

 from ratatoskr.sse_client import (
+    AffectUpdate,
+    AwaitingLlmFirstToken,
    CancelAlreadyCompleted,
    Cancelled,
    CancelResult,
@@ -711,6 +713,47 @@ def _sse_raw_chunk(sse_id: str, raw_data: str) -> bytes:
    return f"id: {sse_id}\ndata: {raw_data}\n\n".encode()


+def _sse_no_id_chunk(data: str) -> bytes:
+    """SSE frame with NO id line + arbitrary data (v0.8.1: keepalive shape)."""
+    return f"data: {data}\n\n".encode()
+
+
+class TestEmptyIdSkipped:
+    @respx.mock
+    async def test_empty_id_on_first_event_skipped(self) -> None:
+        """empty_id_on_first_event_skipped [v0.8.1]: stream starts with an
+        event carrying NO `id:` line → httpx_sse exposes sse.id == ''
+        (no prior id to inherit). Pre-v0.8.1: MalformedSseId raw='' crashed
+        the turn. v0.8.1: treat same as empty-data keepalive — skip silently.
+
+        Observed 2026-05-25 on Worldtree's qwen3.6-35-a3b-heretic provider:
+        the first stream frame had no id line, every turn died with
+        `[malformed_sse_id] raw=''`.
+        """
+        from ratatoskr.sse_client import Done as _Done
+        from ratatoskr.sse_client import Text as _Text
+
+        # First frame: no id line (httpx_sse → sse.id = ""). Skip it.
+        # Subsequent frames have ids; normal processing resumes.
+        stream = (
+            _sse_no_id_chunk('{"type":"keepalive"}')  # ← skipped (sse.id == "")
+            + _sse_chunk("42:1", {"type": "text", "content": "first"})
+            + _sse_chunk("42:2", _DONE_42_6)
+        )
+        respx.post("https://w.example/sessions/s1/messages").mock(
+            return_value=httpx.Response(
+                200, headers={"content-type": "text/event-stream"}, content=stream
+            )
+        )
+        async with httpx.AsyncClient(base_url="https://w.example") as client:
+            events = [e async for e in stream_turn(client, "s1", "hi")]
+        # 2 events — the no-id frame is invisible (no MalformedSseId crash).
+        assert len(events) == 2
+        assert isinstance(events[0], _Text)
+        assert events[0].content == "first"
+        assert isinstance(events[1], _Done)
+
+
 class TestEmptyDataSkipped:
    @respx.mock
    async def test_empty_data_skipped(self) -> None:
@@ -836,3 +879,164 @@ class TestEmptyDataSkipped:
        assert exc_info.value.raw == "x" * 200
        # Exception message also only contains the truncated form
        assert "x" * 5000 not in str(exc_info.value)
+
+
+class TestAffectUpdate:
+    """Worldtree #204 / v0.28.0 — persona-state observability SSE event.
+
+    Two emissions per qualifying turn (persona-enabled agent, non-ephemeral
+    session): `status: "current"` at turn start with full snapshot, then
+    `status: "scheduled"` near turn end (lightweight, no snapshot).
+
+    See docs/conversation-api-spec.md § affect_update.
+    """
+
+    @respx.mock
+    async def test_current_status_parsed_with_snapshot(self) -> None:
+        """current_status_parsed_with_snapshot [tracer]: status=current carries
+        the full snapshot dict; AffectUpdate.snapshot is populated with the
+        nested PAD / dominant_emotion / emotions_active fields.
+        """
+        snapshot = {
+            "agent_id": "mimir",
+            "pad": {"pleasure": 0.52, "arousal": 0.47, "dominance": 0.50},
+            "dominant_emotion": "curiosity",
+            "emotions_active": [
+                {"type": "curiosity", "intensity": 0.6, "decay_remaining_s": 202.7}
+            ],
+            "baseline_pad": {"pleasure": 0.50, "arousal": 0.40, "dominance": 0.50},
+            "mood_drift": {"valence_delta": 0.02, "arousal_delta": 0.07},
+            "last_updated_at": "2026-05-25T22:30:18+00:00",
+        }
+        stream = _sse_chunk(
+            "42:1",
+            {
+                "type": "affect_update",
+                "status": "current",
+                "turn_id": 42,
+                "snapshot": snapshot,
+            },
+        ) + _sse_chunk("42:2", _DONE_42_6)
+        respx.post("https://w.example/sessions/s1/messages").mock(
+            return_value=httpx.Response(
+                200, headers={"content-type": "text/event-stream"}, content=stream
+            )
+        )
+        async with httpx.AsyncClient(base_url="https://w.example") as client:
+            events = [e async for e in stream_turn(client, "s1", "hi")]
+        affect = events[0]
+        assert isinstance(affect, AffectUpdate)
+        assert affect.status == "current"
+        assert affect.turn_id == 42
+        assert affect.snapshot == snapshot
+        assert affect.sse_id == SseId(42, 1)
+
+    @respx.mock
+    async def test_scheduled_status_parsed_no_snapshot(self) -> None:
+        """scheduled_status_parsed_no_snapshot [trace]: status=scheduled carries
+        no snapshot field; AffectUpdate.snapshot is None.
+        """
+        stream = (
+            _sse_chunk("42:1", {"type": "text", "content": "x"})
+            + _sse_chunk(
+                "42:2",
+                {"type": "affect_update", "status": "scheduled", "turn_id": 42},
+            )
+            + _sse_chunk("42:3", _DONE_42_6)
+        )
+        respx.post("https://w.example/sessions/s1/messages").mock(
+            return_value=httpx.Response(
+                200, headers={"content-type": "text/event-stream"}, content=stream
+            )
+        )
+        async with httpx.AsyncClient(base_url="https://w.example") as client:
+            events = [e async for e in stream_turn(client, "s1", "hi")]
+        affect = next(e for e in events if isinstance(e, AffectUpdate))
+        assert affect.status == "scheduled"
+        assert affect.turn_id == 42
+        assert affect.snapshot is None
+        assert affect.sse_id == SseId(42, 2)
+
+
+class TestAwaitingLlmFirstToken:
+    """Worldtree #201 / v0.29.0 — `awaiting_llm_first_token` SSE heartbeat.
+
+    Top-level event (not a worker_phase extension) fired during the
+    BuildingPrompt → CallingLLM gap at the configured interval (default
+    5s). Server-authoritative elapsed_ms is time.monotonic()-based and
+    monotonically increasing across the heartbeat sequence.
+
+    See docs/conversation-api-spec.md § awaiting_llm_first_token.
+    """
+
+    @respx.mock
+    async def test_single_heartbeat_parsed(self) -> None:
+        """single_heartbeat_parsed [tracer]: type=awaiting_llm_first_token →
+        AwaitingLlmFirstToken(turn_id, elapsed_ms_since_building_prompt).
+        """
+        stream = _sse_chunk(
+            "42:1",
+            {
+                "type": "awaiting_llm_first_token",
+                "turn_id": 42,
+                "elapsed_ms_since_building_prompt": 5012.3,
+            },
+        ) + _sse_chunk("42:2", _DONE_42_6)
+        respx.post("https://w.example/sessions/s1/messages").mock(
+            return_value=httpx.Response(
+                200, headers={"content-type": "text/event-stream"}, content=stream
+            )
+        )
+        async with httpx.AsyncClient(base_url="https://w.example") as client:
+            events = [e async for e in stream_turn(client, "s1", "hi")]
+        beat = events[0]
+        assert isinstance(beat, AwaitingLlmFirstToken)
+        assert beat.turn_id == 42
+        assert beat.elapsed_ms_since_building_prompt == 5012.3
+        assert beat.sse_id == SseId(42, 1)
+
+    @respx.mock
+    async def test_heartbeat_sequence_monotonic(self) -> None:
+        """heartbeat_sequence_monotonic [scenario]: three consecutive heartbeats
+        in one turn — elapsed_ms_since_building_prompt monotonically increases,
+        all carry the same turn_id.
+        """
+        stream = (
+            _sse_chunk(
+                "42:1",
+                {
+                    "type": "awaiting_llm_first_token",
+                    "turn_id": 42,
+                    "elapsed_ms_since_building_prompt": 5000.0,
+                },
+            )
+            + _sse_chunk(
+                "42:2",
+                {
+                    "type": "awaiting_llm_first_token",
+                    "turn_id": 42,
+                    "elapsed_ms_since_building_prompt": 10005.4,
+                },
+            )
+            + _sse_chunk(
+                "42:3",
+                {
+                    "type": "awaiting_llm_first_token",
+                    "turn_id": 42,
+                    "elapsed_ms_since_building_prompt": 15011.8,
+                },
+            )
+            + _sse_chunk("42:4", _DONE_42_6)
+        )
+        respx.post("https://w.example/sessions/s1/messages").mock(
+            return_value=httpx.Response(
+                200, headers={"content-type": "text/event-stream"}, content=stream
+            )
+        )
+        async with httpx.AsyncClient(base_url="https://w.example") as client:
+            events = [e async for e in stream_turn(client, "s1", "hi")]
+        beats = [e for e in events if isinstance(e, AwaitingLlmFirstToken)]
+        assert len(beats) == 3
+        elapsed = [b.elapsed_ms_since_building_prompt for b in beats]
+        assert elapsed == sorted(elapsed)  # monotonically increasing
+        assert all(b.turn_id == 42 for b in beats)
@@ -1,5 +1,7 @@
 """Tests for ratatoskr.tier3 per docs/contracts/issues/15.contract.md."""

+from pathlib import Path
+
 import httpx
 import pytest
 import respx
@@ -315,12 +317,29 @@ class TestDeleteAgent:
        assert exc.value.status == 500


+@pytest.fixture
+def _isolated_local_agents(
+    tmp_path: "Path", monkeypatch: pytest.MonkeyPatch
+) -> "Path":
+    """Isolate the v0.8.0 local-tier-3 index from the operator's real file."""
+    path = tmp_path / "local_agents.json"
+    monkeypatch.setenv("RATATOSKR_LOCAL_AGENTS", str(path))
+    return path
+
+
 class TestCli:
    @respx.mock
    def test_cli_define_happy(
-        self, capsys: pytest.CaptureFixture[str], monkeypatch: pytest.MonkeyPatch
+        self,
+        capsys: pytest.CaptureFixture[str],
+        monkeypatch: pytest.MonkeyPatch,
+        _isolated_local_agents: "Path",
    ) -> None:
-        """cli_define_happy [happy]: argv → 201 mock → stdout confirmation."""
+        """cli_define_happy [happy]: argv → 201 mock → stdout confirmation;
+        local index updated with the new entry (v0.8.0 hook).
+        """
+        from ratatoskr.local_agents import load_local_agents
+
        monkeypatch.setenv("WORLDTREE_API_URL", "https://w.example")
        monkeypatch.setenv("WORLDTREE_API_KEY", "k")
        respx.post("https://w.example/agents/define").mock(
@@ -335,12 +354,24 @@ class TestCli:
        out = capsys.readouterr()
        assert rc == 0
        assert out.out.strip() == "defined ratatoskr:wizard (qwen3.6-35-a3b)"
+        # v0.8.0: local index now has the new entry.
+        entries = load_local_agents()
+        assert len(entries) == 1
+        assert entries[0].agent_id == "ratatoskr:wizard"
+        assert entries[0].model == "qwen3.6-35-a3b"

    @respx.mock
    def test_cli_patch_happy(
-        self, capsys: pytest.CaptureFixture[str], monkeypatch: pytest.MonkeyPatch
+        self,
+        capsys: pytest.CaptureFixture[str],
+        monkeypatch: pytest.MonkeyPatch,
+        _isolated_local_agents: "Path",
    ) -> None:
-        """cli_patch_happy [happy]: argv → 200 mock → stdout confirmation."""
+        """cli_patch_happy [happy]: argv → 200 mock → stdout confirmation;
+        local index refreshed with the post-patch state.
+        """
+        from ratatoskr.local_agents import load_local_agents
+
        monkeypatch.setenv("WORLDTREE_API_URL", "https://w.example")
        monkeypatch.setenv("WORLDTREE_API_KEY", "k")
        respx.patch("https://w.example/agents/ratatoskr:wizard").mock(
@@ -350,12 +381,34 @@ class TestCli:
        out = capsys.readouterr()
        assert rc == 0
        assert out.out.strip() == "patched ratatoskr:wizard"
+        entries = load_local_agents()
+        assert len(entries) == 1
+        assert entries[0].agent_id == "ratatoskr:wizard"

    @respx.mock
    def test_cli_delete_happy(
-        self, capsys: pytest.CaptureFixture[str], monkeypatch: pytest.MonkeyPatch
+        self,
+        capsys: pytest.CaptureFixture[str],
+        monkeypatch: pytest.MonkeyPatch,
+        _isolated_local_agents: "Path",
    ) -> None:
-        """cli_delete_happy [happy]: argv → 204 mock → stdout confirmation."""
+        """cli_delete_happy [happy]: argv → 204 mock → stdout confirmation;
+        local index entry removed (v0.8.0 hook).
+        """
+        from ratatoskr.local_agents import (
+            LocalAgentEntry,
+            add_local_agent,
+            load_local_agents,
+        )
+
+        # Pre-populate so we can verify removal.
+        add_local_agent(LocalAgentEntry(
+            agent_id="ratatoskr:wizard",
+            agent_name="wizard",
+            model="m",
+            description="d",
+            defined_at="t",
+        ))
        monkeypatch.setenv("WORLDTREE_API_URL", "https://w.example")
        monkeypatch.setenv("WORLDTREE_API_KEY", "k")
        respx.delete("https://w.example/agents/ratatoskr:wizard").mock(
@@ -365,6 +418,7 @@ class TestCli:
        out = capsys.readouterr()
        assert rc == 0
        assert out.out.strip() == "deleted ratatoskr:wizard"
+        assert load_local_agents() == []

    def test_cli_missing_auth(
        self, capsys: pytest.CaptureFixture[str], monkeypatch: pytest.MonkeyPatch
@@ -0,0 +1,78 @@
+"""Packaging + lazy-import discipline tests for ratatoskr.web per issue #16.
+
+- `index.html` resolvable via importlib.resources (ships in wheel)
+- `ratatoskr.web.entrypoint` importable without starlette+uvicorn,
+  prints install-hint and exits non-zero in that mode
+"""
+
+from importlib.resources import files
+
+
+def test_index_html_in_package() -> None:
+    """static/index.html is locatable via importlib.resources.
+
+    INV-009 packaging discipline. The asset must be part of the
+    installed package — `_static_dir()` in the server uses this exact
+    resolution path at startup.
+    """
+    path = files("ratatoskr.web") / "static" / "index.html"
+    assert path.is_file(), f"index.html missing at {path}"
+    content = path.read_text()
+    assert "<html" in content
+    assert "ratatoskr-web" in content
+
+
+def test_entrypoint_no_top_level_starlette_import() -> None:
+    """INV-001: importing `ratatoskr.web.entrypoint` MUST NOT import
+    starlette or uvicorn at the module level. Verified by AST inspection
+    of the source — checks no top-level `import starlette` /
+    `from starlette` / `import uvicorn` / `from uvicorn` statements.
+    """
+    import ast
+    from importlib.resources import files
+
+    src = (files("ratatoskr.web") / "entrypoint.py").read_text()
+    tree = ast.parse(src)
+    banned = {"starlette", "uvicorn"}
+    for node in tree.body:
+        if isinstance(node, ast.Import):
+            for alias in node.names:
+                top = alias.name.split(".")[0]
+                assert top not in banned, (
+                    f"top-level `import {alias.name}` violates INV-001 "
+                    "lazy-import discipline"
+                )
+        elif isinstance(node, ast.ImportFrom):
+            mod = (node.module or "").split(".")[0]
+            assert mod not in banned, (
+                f"top-level `from {node.module} import ...` violates "
+                "INV-001 lazy-import discipline"
+            )
+
+
+def test_entrypoint_missing_api_key_returns_11(monkeypatch) -> None:
+    """missing_api_key [error]: WORLDTREE_API_KEY unset → exit 11."""
+    monkeypatch.delenv("WORLDTREE_API_KEY", raising=False)
+    from ratatoskr.web.entrypoint import main
+
+    rc = main(["--port", "0"])
+    assert rc == 11
+
+
+def test_entrypoint_missing_extras_returns_12(monkeypatch) -> None:
+    """missing_extras [error]: starlette unimportable → exit 12.
+
+    Simulated by shadowing the import within main()'s try-block via
+    sys.modules tampering — pre-set the offending module to None so the
+    import raises ImportError.
+    """
+    import sys
+
+    monkeypatch.setenv("WORLDTREE_API_KEY", "k")
+    monkeypatch.setenv("WORLDTREE_API_URL", "https://example.com")
+    monkeypatch.setitem(sys.modules, "ratatoskr.web.server", None)
+
+    from ratatoskr.web.entrypoint import main
+
+    rc = main(["--port", "0"])
+    assert rc == 12
@@ -0,0 +1,162 @@
+"""Drift-detection between TUI presentation discipline and web JS
+presenter per issue #16 INV-008.
+
+The JSON fixture at `tests/fixtures/presentation_contract.json`
+enumerates the expected browser-facing event payload for each Event
+type. Server-side serialization (`_event_to_browser_payload`) is
+unit-tested against the fixture. JS-side rendering in
+`src/ratatoskr/web/static/index.html` consumes the same shape — if
+this fixture changes, both sides update in lockstep.
+"""
+
+from __future__ import annotations
+
+import json
+from pathlib import Path
+
+from ratatoskr.sse_client import (
+    AffectUpdate,
+    AwaitingLlmFirstToken,
+    Cancelled,
+    Done,
+    Error,
+    SseId,
+    Text,
+    TextBoundary,
+    Thinking,
+    ToolResult,
+    ToolStart,
+    WorkerPhase,
+)
+from ratatoskr.web.server import _event_to_browser_payload
+
+
+def _load_fixture() -> dict:
+    path = Path(__file__).parent / "fixtures" / "presentation_contract.json"
+    return json.loads(path.read_text())
+
+
+def _check(name: str, event: object) -> None:
+    """Assert (event_type, data) for `event` matches the fixture entry."""
+    fixture = _load_fixture()
+    assert name in fixture, f"fixture missing entry for {name!r}"
+    expected = fixture[name]
+    event_type, data = _event_to_browser_payload(event)
+    assert event_type == expected["event_type"], (
+        f"{name}: event_type {event_type!r} != fixture {expected['event_type']!r}"
+    )
+    assert data == expected["data"], (
+        f"{name}: data mismatch\n  got: {data}\n  fixture: {expected['data']}"
+    )
+
+
+def test_worker_phase_matches_fixture() -> None:
+    _check(
+        "worker_phase",
+        WorkerPhase(sse_id=SseId(42, 3), phase="BuildingPrompt", turn_id=42),
+    )
+
+
+def test_thinking_matches_fixture() -> None:
+    _check(
+        "thinking",
+        Thinking(sse_id=SseId(42, 5), content="Let me think..."),
+    )
+
+
+def test_text_matches_fixture() -> None:
+    _check(
+        "text",
+        Text(sse_id=SseId(42, 7), content="Hello there"),
+    )
+
+
+def test_text_boundary_matches_fixture() -> None:
+    _check(
+        "text_boundary",
+        TextBoundary(
+            sse_id=SseId(42, 8), kind="sentence",
+            char_offset=11, ts="2026-05-28T00:00:00Z",
+        ),
+    )
+
+
+def test_tool_start_matches_fixture() -> None:
+    _check(
+        "tool_start",
+        ToolStart(sse_id=SseId(42, 9), name="search", arguments={"q": "ratatoskr"}),
+    )
+
+
+def test_tool_result_matches_fixture() -> None:
+    _check(
+        "tool_result",
+        ToolResult(
+            sse_id=SseId(42, 10), name="search",
+            result={"n": 1}, duration_ms=12,
+        ),
+    )
+
+
+def test_done_matches_fixture() -> None:
+    _check(
+        "done",
+        Done(
+            sse_id=SseId(42, 11), phase="succeeded", response="Hello there",
+            model="qwen3.6-35-a3b", duration_ms=1234,
+            usage={
+                "prompt_tokens": 100, "completion_tokens": 50,
+                "total_tokens": 150, "cached_input_tokens": 0,
+            },
+        ),
+    )
+
+
+def test_error_matches_fixture() -> None:
+    _check(
+        "error",
+        Error(
+            sse_id=SseId(42, 11), phase="failed",
+            message="llm output invalid", error_code="llm_output_invalid",
+        ),
+    )
+
+
+def test_cancelled_matches_fixture() -> None:
+    _check(
+        "cancelled",
+        Cancelled(
+            sse_id=SseId(42, 11), phase="cancelled", turn_id=42,
+            reason="user_cancel", partial_message_id=None,
+        ),
+    )
+
+
+def test_affect_update_matches_fixture() -> None:
+    _check(
+        "affect_update",
+        AffectUpdate(
+            sse_id=SseId(42, 1), status="current", turn_id=42,
+            snapshot={
+                "agent_id": "mimir",
+                "pad": {"pleasure": 0.52, "arousal": 0.47, "dominance": 0.50},
+                "dominant_emotion": "curiosity",
+                "emotions_active": [
+                    {"type": "curiosity", "intensity": 0.6, "decay_remaining_s": 202.7}
+                ],
+                "baseline_pad": {"pleasure": 0.50, "arousal": 0.40, "dominance": 0.50},
+                "mood_drift": {"valence_delta": 0.02, "arousal_delta": 0.07},
+                "last_updated_at": "2026-05-28T00:00:00+00:00",
+            },
+        ),
+    )
+
+
+def test_awaiting_llm_first_token_matches_fixture() -> None:
+    _check(
+        "awaiting_llm_first_token",
+        AwaitingLlmFirstToken(
+            sse_id=SseId(42, 2), turn_id=42,
+            elapsed_ms_since_building_prompt=5012.3,
+        ),
+    )
@@ -0,0 +1,450 @@
+"""Tests for ratatoskr.web.server per docs/contracts/issues/16.contract.md.
+
+The TestClient drives the Starlette app with a respx-mocked upstream
+httpx client. No live network. See INV-002: create_app takes a
+client_factory callable; tests pass a factory returning a respx-mocked
+AsyncClient.
+"""
+
+import httpx
+import pytest
+import respx
+from starlette.testclient import TestClient
+
+
+def _mock_client_factory() -> "object":
+    """A client_factory that returns a no-base-url AsyncClient suitable
+    for respx-mocking absolute URLs. Endpoints that hit upstream use the
+    same factory in tests as in prod; respx intercepts at the transport
+    layer.
+    """
+    def factory() -> httpx.AsyncClient:
+        return httpx.AsyncClient(base_url="https://w.example")
+    return factory
+
+
+class TestVersionEndpoint:
+    """version_endpoint FN — tracer per contract issue #16."""
+
+    def test_happy_returns_current_version(self) -> None:
+        """happy [tracer]: GET /version → 200, body == {"ratatoskr": "<current-version>"}.
+
+        Validates: Starlette app boots, route registers, JSON shape correct,
+        version derived from package metadata (importlib.metadata).
+        """
+        from importlib.metadata import version
+
+        from ratatoskr.web.server import create_app
+
+        app = create_app(_mock_client_factory())
+        client = TestClient(app)
+        resp = client.get("/version")
+        assert resp.status_code == 200
+        assert resp.json() == {"ratatoskr": version("ratatoskr")}
+
+
+class TestAgentsEndpoint:
+    """agents_endpoint FN — proxy upstream /agents + merge with local tier3 index."""
+
+    @respx.mock
+    def test_happy_merges_upstream_and_local(self, monkeypatch: pytest.MonkeyPatch, tmp_path) -> None:
+        """happy [tracer]: respx mock /agents 200 → response merges upstream + local index."""
+        # Isolate local agents index to tmp
+        monkeypatch.setenv("RATATOSKR_LOCAL_AGENTS", str(tmp_path / "local_agents.json"))
+        respx.get("https://w.example/agents").mock(
+            return_value=httpx.Response(
+                200,
+                json=[
+                    {"agent_id": "mimir", "name": "Mimir", "description": "k"},
+                ],
+            )
+        )
+        # Add one local tier3 agent to the index
+        from ratatoskr.local_agents import LocalAgentEntry, add_local_agent
+
+        add_local_agent(
+            LocalAgentEntry(
+                agent_id="ratatoskr:sindra",
+                agent_name="sindra",
+                model="artemis-31b-v1i",
+                description="(tier 3) IDENTITY",
+                defined_at="2026-05-28T00:00:00+00:00",
+            )
+        )
+
+        from ratatoskr.web.server import create_app
+
+        app = create_app(_mock_client_factory())
+        client = TestClient(app)
+        resp = client.get("/api/agents")
+        assert resp.status_code == 200
+        body = resp.json()
+        ids = [a["agent_id"] for a in body]
+        assert "mimir" in ids
+        assert "ratatoskr:sindra" in ids
+
+    @respx.mock
+    def test_upstream_500_returns_500_envelope(self, monkeypatch, tmp_path) -> None:
+        """upstream_500 [error]: respx 500 → 500 with error_code envelope."""
+        monkeypatch.setenv("RATATOSKR_LOCAL_AGENTS", str(tmp_path / "local_agents.json"))
+        respx.get("https://w.example/agents").mock(return_value=httpx.Response(500, content=b"boom"))
+        from ratatoskr.web.server import create_app
+        app = create_app(_mock_client_factory())
+        resp = TestClient(app).get("/api/agents")
+        assert resp.status_code == 500
+        assert resp.json()["error_code"] == "session_api_failed"
+
+    @respx.mock
+    def test_network_error_returns_502(self, monkeypatch, tmp_path) -> None:
+        """network_error [error]: connection refused → 502 with network_error envelope."""
+        monkeypatch.setenv("RATATOSKR_LOCAL_AGENTS", str(tmp_path / "local_agents.json"))
+        respx.get("https://w.example/agents").mock(side_effect=httpx.ConnectError("refused"))
+        from ratatoskr.web.server import create_app
+        app = create_app(_mock_client_factory())
+        resp = TestClient(app).get("/api/agents")
+        assert resp.status_code == 502
+        assert resp.json()["error_code"] == "network_error"
+
+    @respx.mock
+    def test_local_dedup(self, monkeypatch, tmp_path) -> None:
+        """local_dedup [scenario]: local entry with same agent_id as upstream → no duplicate."""
+        monkeypatch.setenv("RATATOSKR_LOCAL_AGENTS", str(tmp_path / "local_agents.json"))
+        respx.get("https://w.example/agents").mock(
+            return_value=httpx.Response(
+                200,
+                json=[{"agent_id": "ratatoskr:sindra", "name": "Sindra-from-server", "description": ""}],
+            )
+        )
+        from ratatoskr.local_agents import LocalAgentEntry, add_local_agent
+        add_local_agent(
+            LocalAgentEntry(
+                agent_id="ratatoskr:sindra", agent_name="sindra", model="m",
+                description="local-tier3", defined_at="2026-05-28T00:00:00+00:00",
+            )
+        )
+        from ratatoskr.web.server import create_app
+        app = create_app(_mock_client_factory())
+        resp = TestClient(app).get("/api/agents")
+        assert resp.status_code == 200
+        body = resp.json()
+        ids = [a["agent_id"] for a in body]
+        assert ids.count("ratatoskr:sindra") == 1
+        # Upstream entry wins (it's first in the merge); local is deduped
+        assert body[0]["name"] == "Sindra-from-server"
+
+
+_CREATE_OK = {
+    "session_id": "s-1",
+    "agent_id": "mimir",
+    "message_count": 0,
+    "created_at": "2026-05-28T00:00:00+00:00",
+    "last_active": "2026-05-28T00:00:00+00:00",
+    "metadata": {},
+}
+
+
+class TestCreateSessionEndpoint:
+    """create_session_endpoint FN — proxy POST /sessions to upstream."""
+
+    @respx.mock
+    def test_happy_returns_201(self) -> None:
+        """happy [tracer]: respx mock 201 → endpoint returns 201 with session JSON."""
+        respx.post("https://w.example/sessions").mock(return_value=httpx.Response(201, json=_CREATE_OK))
+        from ratatoskr.web.server import create_app
+        app = create_app(_mock_client_factory())
+        resp = TestClient(app).post("/api/sessions", json={"agent_id": "mimir"})
+        assert resp.status_code == 201
+        assert resp.json()["session_id"] == "s-1"
+
+    @respx.mock
+    def test_unknown_agent_returns_404(self) -> None:
+        """unknown_agent [error]: respx 404 → 404 with agent_not_found envelope."""
+        respx.post("https://w.example/sessions").mock(
+            return_value=httpx.Response(404, json={"error": "unknown_agent_id"})
+        )
+        from ratatoskr.web.server import create_app
+        app = create_app(_mock_client_factory())
+        resp = TestClient(app).post("/api/sessions", json={"agent_id": "ghost"})
+        assert resp.status_code == 404
+        assert resp.json()["error_code"] == "agent_not_found"
+
+    def test_missing_agent_id_returns_400(self) -> None:
+        """missing_agent_id [adversarial]: body without agent_id → 400."""
+        from ratatoskr.web.server import create_app
+        app = create_app(_mock_client_factory())
+        resp = TestClient(app).post("/api/sessions", json={})
+        assert resp.status_code == 400
+
+
+_SNAPSHOT = {
+    "agent_id": "mimir",
+    "pad": {"pleasure": 0.5, "arousal": 0.4, "dominance": 0.5},
+    "dominant_emotion": "curiosity",
+}
+
+
+class TestPersonaStateEndpoint:
+    """persona_state_endpoint FN — proxy upstream GET /agents/{id}/persona_state."""
+
+    @respx.mock
+    def test_happy_returns_snapshot(self) -> None:
+        """happy [tracer]: respx 200 → 200 with snapshot."""
+        respx.get("https://w.example/agents/mimir/persona_state").mock(
+            return_value=httpx.Response(200, json=_SNAPSHOT)
+        )
+        from ratatoskr.web.server import create_app
+        app = create_app(_mock_client_factory())
+        resp = TestClient(app).get("/api/agents/mimir/persona_state")
+        assert resp.status_code == 200
+        assert resp.json()["dominant_emotion"] == "curiosity"
+
+    @respx.mock
+    def test_persona_not_configured(self) -> None:
+        """persona_not_configured [error]: 404 + persona_not_configured → 404 envelope."""
+        respx.get("https://w.example/agents/domari/persona_state").mock(
+            return_value=httpx.Response(404, json={"error_code": "persona_not_configured"})
+        )
+        from ratatoskr.web.server import create_app
+        app = create_app(_mock_client_factory())
+        resp = TestClient(app).get("/api/agents/domari/persona_state")
+        assert resp.status_code == 404
+        assert resp.json()["error_code"] == "persona_not_configured"
+
+    @respx.mock
+    def test_agent_not_available(self) -> None:
+        """agent_not_available [error]: 404 + agent_not_available → 404 envelope."""
+        respx.get("https://w.example/agents/bogus/persona_state").mock(
+            return_value=httpx.Response(404, json={"error_code": "agent_not_available"})
+        )
+        from ratatoskr.web.server import create_app
+        app = create_app(_mock_client_factory())
+        resp = TestClient(app).get("/api/agents/bogus/persona_state")
+        assert resp.status_code == 404
+        assert resp.json()["error_code"] == "agent_not_available"
+
+    @respx.mock
+    def test_auth_scope_denied(self) -> None:
+        """auth_scope_denied [error]: 403 + auth_scope_denied → 403 envelope."""
+        respx.get("https://w.example/agents/mimir/persona_state").mock(
+            return_value=httpx.Response(403, json={"error_code": "auth_scope_denied"})
+        )
+        from ratatoskr.web.server import create_app
+        app = create_app(_mock_client_factory())
+        resp = TestClient(app).get("/api/agents/mimir/persona_state")
+        assert resp.status_code == 403
+        assert resp.json()["error_code"] == "auth_scope_denied"
+
+
+class TestSubmitTurnEndpoint:
+    """submit_turn_endpoint FN — allocate turn_id, register in turn_registry."""
+
+    def test_happy_returns_turn_id(self) -> None:
+        """happy [tracer]: POST {"content": "hi"} → 200 with turn_id; registry populated."""
+        from ratatoskr.web.server import create_app
+        app = create_app(_mock_client_factory())
+        resp = TestClient(app).post("/api/turns/s-1", json={"content": "hello"})
+        assert resp.status_code == 200
+        body = resp.json()
+        assert isinstance(body["turn_id"], int)
+        assert body["turn_id"] > 0
+        # Registry has the entry
+        handle = app.state.turn_registry[("s-1", body["turn_id"])]
+        assert handle.content == "hello"
+        assert handle.status == "queued"
+
+    def test_missing_content_returns_400(self) -> None:
+        """missing_content [adversarial]: body without content → 400."""
+        from ratatoskr.web.server import create_app
+        app = create_app(_mock_client_factory())
+        resp = TestClient(app).post("/api/turns/s-1", json={})
+        assert resp.status_code == 400
+
+    def test_monotonic_turn_ids(self) -> None:
+        """monotonic_turn_ids [trace]: two submits → second turn_id > first."""
+        from ratatoskr.web.server import create_app
+        app = create_app(_mock_client_factory())
+        c = TestClient(app)
+        first = c.post("/api/turns/s-1", json={"content": "a"}).json()["turn_id"]
+        second = c.post("/api/turns/s-2", json={"content": "b"}).json()["turn_id"]
+        assert second > first
+
+
+_DONE_BODY = {
+    "type": "done",
+    "phase": "succeeded",
+    "response": "hello",
+    "model": "m",
+    "duration_ms": 1,
+    "usage": {"prompt_tokens": 0, "completion_tokens": 0, "total_tokens": 0, "cached_input_tokens": 0},
+}
+
+
+def _sse_chunk(sse_id: str, body: dict) -> bytes:
+    import json as _j
+    return f"id: {sse_id}\ndata: {_j.dumps(body)}\n\n".encode()
+
+
+def _sse_resp(stream: bytes) -> httpx.Response:
+    return httpx.Response(200, headers={"content-type": "text/event-stream"}, content=stream)
+
+
+def _parse_browser_sse(raw: bytes) -> list[dict]:
+    """Parse a server-to-browser SSE stream into [{"event": str, "data": dict}, ...]."""
+    import json as _j
+    events: list[dict] = []
+    for block in raw.decode().split("\n\n"):
+        block = block.strip()
+        if not block:
+            continue
+        event_type = None
+        data_str = None
+        for line in block.splitlines():
+            if line.startswith("event: "):
+                event_type = line[len("event: "):]
+            elif line.startswith("data: "):
+                data_str = line[len("data: "):]
+        if event_type and data_str is not None:
+            events.append({"event": event_type, "data": _j.loads(data_str)})
+    return events
+
+
+class TestStreamTurnEndpoint:
+    """stream_turn_endpoint FN — open upstream SSE, proxy events to browser."""
+
+    @respx.mock
+    def test_happy_text_done(self) -> None:
+        """happy [tracer]: respx mock one text+done → SSE stream yields text + done events."""
+        stream = _sse_chunk("42:1", {"type": "text", "content": "hello"}) + _sse_chunk("42:2", _DONE_BODY)
+        respx.post("https://w.example/sessions/s-1/messages").mock(return_value=_sse_resp(stream))
+        from ratatoskr.web.server import create_app
+        app = create_app(_mock_client_factory())
+        c = TestClient(app)
+        turn_id = c.post("/api/turns/s-1", json={"content": "hi"}).json()["turn_id"]
+        with c.stream("GET", f"/api/turns/s-1/stream?turn_id={turn_id}") as resp:
+            assert resp.status_code == 200
+            raw = b"".join(resp.iter_bytes())
+        events = _parse_browser_sse(raw)
+        types = [e["event"] for e in events]
+        assert "text" in types
+        assert "done" in types
+        # Registry cleaned up
+        assert ("s-1", turn_id) not in app.state.turn_registry
+
+    def test_unknown_turn_returns_404(self) -> None:
+        """unknown_turn [error]: GET with turn_id not in registry → 404."""
+        from ratatoskr.web.server import create_app
+        app = create_app(_mock_client_factory())
+        resp = TestClient(app).get("/api/turns/s-x/stream?turn_id=999")
+        assert resp.status_code == 404
+
+    @respx.mock
+    def test_upstream_error_synthetic_event(self) -> None:
+        """upstream_error [error]: respx 500 → synthetic error SSE event."""
+        respx.post("https://w.example/sessions/s-1/messages").mock(
+            return_value=httpx.Response(500, content=b"boom")
+        )
+        from ratatoskr.web.server import create_app
+        app = create_app(_mock_client_factory())
+        c = TestClient(app)
+        turn_id = c.post("/api/turns/s-1", json={"content": "hi"}).json()["turn_id"]
+        with c.stream("GET", f"/api/turns/s-1/stream?turn_id={turn_id}") as resp:
+            raw = b"".join(resp.iter_bytes())
+        events = _parse_browser_sse(raw)
+        types = [e["event"] for e in events]
+        assert "error" in types
+        # Surfaces upstream's exception type for the operator
+        err = next(e for e in events if e["event"] == "error")
+        assert err["data"]["exception"] == "SseConnectFailed"
+
+
+_CANCEL_OK = {"turn_id": 42, "cancelled": True, "reason": None, "partial_message_id": None}
+
+
+class TestCancelTurnEndpoint:
+    """cancel_turn_endpoint FN — proxy upstream cancel for registered turn."""
+
+    @respx.mock
+    def test_happy_cancels(self) -> None:
+        """happy [tracer]: registered turn → POST cancel → 200, upstream cancel called."""
+        route = respx.post("https://w.example/sessions/s-1/turns/").mock(
+            return_value=httpx.Response(200, json=_CANCEL_OK)
+        )
+        from ratatoskr.web.server import create_app
+        app = create_app(_mock_client_factory())
+        c = TestClient(app)
+        turn_id = c.post("/api/turns/s-1", json={"content": "hi"}).json()["turn_id"]
+        # Re-mock at the precise URL with the resolved turn_id
+        respx.post(f"https://w.example/sessions/s-1/turns/{turn_id}/cancel").mock(
+            return_value=httpx.Response(200, json={**_CANCEL_OK, "turn_id": turn_id})
+        )
+        resp = c.post(f"/api/turns/s-1/cancel?turn_id={turn_id}")
+        assert resp.status_code == 200
+        assert resp.json()["cancelled"] is True
+        assert ("s-1", turn_id) not in app.state.turn_registry
+
+    def test_unknown_turn_returns_404(self) -> None:
+        """unknown_turn [error]: not in registry → 404."""
+        from ratatoskr.web.server import create_app
+        app = create_app(_mock_client_factory())
+        resp = TestClient(app).post("/api/turns/s-x/cancel?turn_id=999")
+        assert resp.status_code == 404
+
+    @respx.mock
+    def test_already_completed_race(self) -> None:
+        """already_completed [race]: respx 409 → 200 with reason=race_or_completed."""
+        from ratatoskr.web.server import create_app
+        app = create_app(_mock_client_factory())
+        c = TestClient(app)
+        turn_id = c.post("/api/turns/s-1", json={"content": "hi"}).json()["turn_id"]
+        respx.post(f"https://w.example/sessions/s-1/turns/{turn_id}/cancel").mock(
+            return_value=httpx.Response(409)
+        )
+        resp = c.post(f"/api/turns/s-1/cancel?turn_id={turn_id}")
+        assert resp.status_code == 200
+        assert resp.json()["cancelled"] is False
+        assert resp.json()["reason"] == "race_or_completed"
+
+
+class TestStaticServing:
+    """root_endpoint FN + /static mount — index.html + static asset serving."""
+
+    def test_root_returns_html(self) -> None:
+        """happy [tracer]: GET / → 200, content-type text/html, body contains '<html'."""
+        from ratatoskr.web.server import create_app
+        app = create_app(_mock_client_factory())
+        resp = TestClient(app).get("/")
+        assert resp.status_code == 200
+        assert "text/html" in resp.headers["content-type"]
+        assert "<html" in resp.text
+
+
+class TestLifespanShutdown:
+    """lifespan_shutdown FN — INV-006: drain turn_registry within 5s budget."""
+
+    @respx.mock
+    def test_happy_drains_registry(self) -> None:
+        """happy [tracer]: 2 in-flight turns + shutdown → upstream cancels called."""
+        from ratatoskr.web.server import TurnHandle, create_app
+
+        cancel_routes = []
+        for tid in (101, 102):
+            cancel_routes.append(
+                respx.post(f"https://w.example/sessions/s-1/turns/{tid}/cancel").mock(
+                    return_value=httpx.Response(200, json={
+                        "turn_id": tid, "cancelled": True, "reason": None,
+                        "partial_message_id": None,
+                    })
+                )
+            )
+        app = create_app(_mock_client_factory())
+        with TestClient(app) as client:
+            # Pretend two turns are in-flight (status=streaming)
+            for tid in (101, 102):
+                app.state.turn_registry[("s-1", tid)] = TurnHandle(
+                    session_id="s-1", turn_id=tid, content="x", status="streaming",
+                )
+            # The exit of the `with` triggers lifespan shutdown
+        # After lifespan shutdown:
+        for route in cancel_routes:
+            assert route.called, "upstream cancel should have been issued for each in-flight turn"
+        assert app.state.turn_registry == {}
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 ]

+[[package]]
+name = "httptools"
+version = "0.8.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/43/e5/d471fcb0e14523fe1c3f4ba58ca52480e7bd70ad7109a3846bc75892f7fb/httptools-0.8.0.tar.gz", hash = "sha256:6b2a32f18d97e16e90827d7a819ffa8dbd8cc245fc4e1fa9d1095b54ef4bd999", size = 271342 }
+wheels = [
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+    { url = "https://files.pythonhosted.org/packages/a5/42/cc4feea2945cb3051038f090c9b36bd5b8a9d7f5a894a506a8983e33fd1c/httptools-0.8.0-cp312-cp312-macosx_11_0_arm64.whl", hash = "sha256:5931891fb7b441b8a3853cf1b85c82c903defce084dd5f6771ca46e31bf862c5", size = 113064 },
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