feat(tui): ambient passes read from store, not the live ring (AUR-267)

[mishanefedov]

Linear: AUR-267

Summary

The TUI's reducer already kept a 500-event ring (MAX_EVENTS = 500 in src/ui/state.ts), but the ambient passes computed from it (computeBudgetStatus, anomaly scoring, sub-agent child counts) were therefore also capped at 500. That made budget rollups undercount on busy days and anomaly histories shallow.

This PR keeps the reducer / live tail unchanged (it still drives the timeline view) and switches the ambient passes to source from the SQLite store via a new EventStore.listRecentEvents() method:

• Budget: queries up to 50k events from the last 30 days (covers per-session caps + today rollup).
• Anomaly: queries the last 5k events newest-first (enough for MAD z-score baselines + stuck-loop detection).
• childCountByAgentId: queries the last 10k events.
• Launch backfill: seeds the live tail from store.listRecentEvents({ limit: 500 }) so the timeline isn't empty before adapter JSONL backfill re-emits. wrapSinkWithStore dedup handles any id collisions.

When store === null (e.g. a read-only $HOME), all four passes fall back to state.events so the TUI remains usable.

Acceptance criteria

• TUI reducer no longer holds the full event buffer in React state — state.events capped at 500 events for the live SSE/timeline view; everything else queried lazily from the store.
• All ambient passes (anomaly, budget, sub-agent counts) read inputs from the store, not from the React buffer.
• No regression in TUI responsiveness — state.events still capped at 500; useMemo deps unchanged in shape (just the body queries the store).
• Pause/resume still works (reducer untouched).
• Existing tests pass.
• Backfill on launch reads recent events from the store.

Out of scope (folded the AC where it doesn't apply)

The original ticket mentioned "the 4 MB backfill" + "47 reducer tests rewritten." The 4 MB backfill lives in adapters (per-JSONL re-tail); they still need to read JSONL because hermes/openclaw don't share the SQLite. The reducer's 500-event ring already matched the AC shape, so the 47 reducer tests stayed green without rewrite. Project-index / sessionRows passes moved to the web UI in v0.0.4 already, so that AC bullet is N/A in the TUI.

Test plan

• npm run typecheck — clean
• npm test — 368/368 pass (was 364; +4 new in sqlite.test.ts covering listRecentEvents desc/asc, sinceTs, and limit clamp)
• npm run build — server (tsup) + web (vite) both build