Dmitriy Kovalenko adfcac1a42
Serialize session index mutations across processes ( #57358 ) ...
## Why
The process-local mutex cannot coordinate session name appends and removals from multiple Codex processes sharing the same home directory.
## What changed
- Guard index mutations with a persistent `session_index.jsonl.lock` file, retaining the lock until the blocking worker finishes even if its caller is cancelled.
- Return a timeout error after 30 seconds of lock contention without modifying the index.
- Rewrite removals through a unique temporary file while preserving index permissions, and skip removal when the index is absent.
## Testing
Update regression tests to check lock retention after cancellation, timeout without writing, successful writes after contention clears, and removal with a missing home directory. Retain coverage for cancelled queued updates preserving the next write.
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Dmitriy Kovalenko
adfcac1a42