init: seed Ratatoskr from corviduo-project-template + ship v0 scaffold

Worldtree Conversation API debug TUI. Multi-pane observability dashboard:
chat transcript + persona/Vili affect log + tool events + admin events +
Bifrost state + tool inventory + (opt-in) raw server log.

Design locked at docs/design-brief.md (originated as
brokkr-smithy/docs/ratatoskr-design-brief.md). Operator-locked decisions:

- Textual application-shell framework (multi-pane dashboard, not REPL).
- Separate repo + separate dev team (no Worldtree-source imports).
- httpx-sse for SSE consumption (reference Python SSE-resume impl).
- Triple version-skew mitigation: spec-pin in pyproject.toml + recorded
  SSE snapshot tests + conformance smoke. Initial pin: Worldtree v0.19.0
  at 55101e909abcd2219833266b6f905c5bc956e0f0.
- Persona pane: label-don't-refuse PII posture.
- Server-log pane: opt-in via --server-log <path>.
- Two-stage Ctrl-C (cancel then exit).
- Markdown rendering default-on; --raw opt-out.

In the box:

- docs/design-brief.md — the locked design with full rationale.
- docs/SPEC-PIN.md — Worldtree spec pin + bump procedure.
- docs/conversation-api-spec.md + docs/conversation_api.contract.md —
  vendored Worldtree spec snapshots at the pinned SHA.
- pyproject.toml — Python 3.12, hatchling, uv-managed, deps locked.
- src/ratatoskr/ — stub package (cli.py raises NotImplementedError).
- tests/test_no_worldtree_imports.py — boundary smoke test PASSING.
- tests/snapshots/README.md — recording convention for SSE snapshot tests.

Not in the box yet:

- Gitea remote (operator/infra-ops to register at vh/ratatoskr).
- Implementation — the dev team owns this; design brief is the spec.

Origin: althing thread 01KS3R34XD3N6HMK91VXESHGW7 (worldtree-dev →
brokkr-smithy-dev, 2026-05-20). Volva consulted via thread
01KS3VF6W33N3V5FNMGQ91YNVD.

.sleipnir/config.yaml.template

@@ -0,0 +1,54 @@
+# Sleipnir per-project config for ratatoskr.
+#
+# Copy to .sleipnir/config.yaml (gitignored) and adjust per-checkout.
+# User-global config lives at ~/.config/sleipnir/config.yaml.
+#
+# Schema verified against:
+#   src/sleipnir/cli.py:505-528           (issue_tracker instantiation)
+#   src/sleipnir/orchestrator.py:367-368  (stages.plan + stages.verifier)
+#   src/sleipnir/jobs.py:9                (VALID_PHASES)
+#   tests/conftest.py:10-32               (gold-standard config shape)
+
+stages:
+  plan:
+    provider: claude_code_oneshot
+    model: claude-sonnet-4-6
+  verifier:
+    provider: openai_compat
+    model: glm-5.1
+  implement:
+    provider: claude_code_oneshot
+    model: claude-sonnet-4-6
+  review:
+    provider: claude_code_oneshot
+    model: claude-opus-4-7
+
+providers:
+  openai_compat:
+    base_url: https://api.z.ai/api/coding/paas/v4
+    api_key_env: Z_AI_API_KEY
+    timeout_seconds: 3000
+  claude_code_oneshot:
+    timeout_seconds: 900
+  # Plug in the issue tracker once ratatoskr is registered with Gitea:
+  # ratatoskr_issues:
+  #   repo: /home/lkraven/development/ratatoskr
+
+# sandbox_provider: docker
+# issue_tracker: ratatoskr_issues
+agent_runtime: claude_code
+
+passthrough_env:
+  - Z_AI_API_KEY
+  - GITEA_TOKEN
+  - ANTHROPIC_API_KEY
+  - TASK_BOARD_URL
+
+concurrency: 1
+max_rounds: 3
+
+dispatch:
+  dependency_aware: true             # INV-029: hold dependents at intake
+                                     # when their `dependencies:` frontmatter
+                                     # block points at issues that are open /
+                                     # closed-but-not-on-main / orphaned-without-merge.