Bring the browser surface to TUI parity as the primary debug surface:
- Tools inventory (GET /sessions/{id}/tools) folded into the tools pane —
what the LLM has at turn-fire, above the live tool events.
- BifrostState pane (GET /admin/sessions/{id}/bifrost) — admin-scoped
dispatch state; the admin key stays server-side (app.state.admin_key),
never reaches the browser (INV-003 precedent).
- AdminEvents pane (GET /admin/events SSE) — admin lifecycle, session-
filtered SERVER-side (heartbeats + other-session events dropped); one
fixed "admin_event" browser event so every type renders (no drops).
- PAD refresh: poll a window (1.5/3.5/6.5/10.5s) instead of a single 2s
shot that raced the post-turn-async affect.emit (issue #18 foot-gun).
- Reasoning indicator: ephemeral "<Agent> is pondering…" in the transcript
on `thinking` deltas, cleared when text begins — clearly non-engine.
Admin key wired through entrypoint -> create_app. 9 new respx/route tests
(admin-bearer override, filter unit, SSE stream-filter); 59 web tests pass.
Live-proven against ratatoskr:sindra (bifrost connected, both caps; 253
thinking events -> indicator fires; affect emit lands -> PAD poll catches it).
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