keith thornhill 24edd7b890 Expose detailed agent tree shutdown failure reports (#51515) ...

## Why

Agent tree shutdown previously returned a generic error without identifying which operation or thread failed, making cleanup failures difficult to diagnose.

## What changed

- Add `AgentTreeShutdown::wait_detailed()` and public report types while preserving the existing `wait()` result and error message.
- Record operation, optional thread ID, and either an abandoned teardown guard or a failed phase with a payload-free error category across session cleanup, child spawn cleanup, and resident eviction.
- Give each tree a correlation ID, log each failure, and retain up to 64 failures with a count of additional failures omitted. Record failures before releasing tree membership so all completed waiters observe the same report.

## Testing

Add unit coverage for aborted and completed teardown, cloned guard context, concurrent and repeated waiters, omitted failure counts, and report formatting without raw error payloads. Extend integration coverage for successful tree shutdown and persistence writer failures, including compatibility with `wait()`.

GitOrigin-RevId: 68784af28b63e875b00a55d78729f0cc5b01ac15

2026-10-06 23:28:55 +00:00

..

src

Expose detailed agent tree shutdown failure reports (#51515)

2026-10-06 23:28:55 +00:00

BUILD.bazel

Add codex-core public API listing (#20243)

2026-04-29 22:58:08 +00:00

Cargo.toml

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

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