chess ed42068c45 Add a turn-scoped service tier override (#40616) ...

## What changed

- Add `serviceTierForTurn` to `turn/start` so a newly started turn can override the service tier without changing the thread's saved tier.
- Treat `"default"` as standard speed and omitted or `null` values as inheriting the thread tier.
- Keep `serviceTier` authoritative for subsequent turns when both fields are supplied, and ignore the turn-scoped override when steering an active turn.

## Testing

- Extend the app-server turn-start test to verify both the one-turn `"default"` override and inheritance on the following turn.

GitOrigin-RevId: 4c2c4db21d8d31617a7a6e6df65bf54834e72383

2026-08-25 14:04:32 +00:00

..

src

Add a turn-scoped service tier override (#40616)

2026-08-25 14:04:32 +00:00

tests

Support managed AWS access keys for Amazon Bedrock (#40481)

2026-08-24 21:39:48 +00:00

BUILD.bazel

[codex] Shard exec Bazel integration test (#19862)

2026-04-27 21:22:53 +00:00

Cargo.toml

Extract persisted history types into a dedicated crate (#37871)

2026-08-10 19:26:52 +00:00