codex

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Eric Traut 5e26f7621c Make the app-server thread unload delay configurable (#42320 )

## What changed

- Add the top-level `thread_unload_delay_secs` configuration key for the
  app-server, with a 60-second default instead of the previous 30-minute
  fixed delay.
- Allow zero-delay unloading and reject values that cannot fit in a
  monotonic-clock deadline.
- Reset the unload countdown when a thread gains a subscriber or becomes
  active, and preserve active turns even when the configured delay is zero.
- Document that unloading ephemeral threads discards their in-memory state.

## Testing

- Cover configuration parsing, defaults, overrides, and overflow rejection.
- Cover unsubscribe, resubscribe, delayed and immediate unloading,
  notifications, persisted-thread resume, and WebSocket disconnect behavior.

GitOrigin-RevId: edd46f6b49bbdafbf606bff74378e8f569e95977

2026-09-02 18:18:54 +00:00