fix(bridges): bump idle timeout to 6h + slow-poll after 10min silence

[replicas-connector]

Summary

Screenshot showed a Failed frame at 30:06 in a turn where the agent had legitimately done 4 tools + multiple narration blocks, then went into a thinking phase where /history stopped reporting fresh events for 30 min. PR #35's 30-min idle cap was too aggressive.

Two changes (both bridges)

#1 IDLE_TIMEOUT_MS 30 min → 6 hours

Long thinking phases + waiting-on-user scenarios fit comfortably; truly abandoned watchers still get reaped instead of polling forever. Dispatch + auto-cleanup paths already handle the orphan case; this just gives them more room.

#2 Slow-poll after 10 min silence

New SLOW_POLL_THRESHOLD_MS (10 min) + SLOW_POLL_INTERVAL_MS (30s). After 10 min of silence the alarm interval drops from 180ms to 30s — saves CF Worker invocations, KV reads, and Replicas /history calls during agent thinking phases. When events resume, the next tick notices and cadence snaps back to 180ms.

Net

Heavy ops + long thinking work unchanged; idle phases cost ~99% less; orphan detection still works on a 6-hour horizon.

Validation

• Matrix: 173/173 ✅ · typecheck clean · deployed 9db5e005
• Telegram: 99/99 ✅ · typecheck clean · deployed 1a87a434

Test plan

• Typecheck + tests + deploy
• Smoke: turn that thinks silently for 30+ min should no longer Fail
• Smoke: confirm cadence is fast (~180ms) during active phases and slow (~30s) after 10 min silence

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_{Created by Jaden (jadengarza@pm.me) with Replicas
Workspace  ·  Slack Thread}

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