jif 18d7ace221 Move Guardian reviewer lifecycle into the extension (#45537) ...

## Why

Guardian reviews must stop when their parent shuts down or their history is reset. Shutdown must also finish reviewer cleanup before closing the parent's persistent history, including when a review is waiting to retry after a rate limit.

## What changed

- Let the Guardian extension own reviewer startup, prewarming, and shutdown through `ThreadManager`, tracking and joining outstanding work during teardown.
- Cancel reviews on history reset or parent shutdown and reject decisions returned after cancellation, including cached extension decisions.
- Keep background prewarm previews from overwriting the active turn's model metadata.

## Testing

Extend regression coverage to verify reviewer cleanup after parent shutdown, prompt shutdown during a 60-second Guardian retry with the network request denied, and preservation of active model review requirements during prewarming.

GitOrigin-RevId: 05efc369b9a1642a10365eac8a09da77f3f6e28c

2026-09-14 22:58:51 +00:00

..

examples

Require content kinds for extension prompt fragments (#40177)

2026-08-23 03:12:58 +00:00

src

Move Guardian reviewer lifecycle into the extension (#45537)

2026-09-14 22:58:51 +00:00

tests

Remove Guardian subagent-spawner plumbing (#45491)

2026-09-14 18:56:43 +00:00

BUILD.bazel

extension: add initial typed extension API (#21736)

2026-05-11 11:06:24 +02:00

Cargo.toml

Preserve verified answers across history compaction (#42293)

2026-09-02 15:07:11 +00:00

notes.md

extension: add initial typed extension API (#21736)

2026-05-11 11:06:24 +02:00