Enforce single-writer ownership for paginated threads - #34986
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## Why Only one app-server process should keep a paginated thread open for writing at a time, while other processes must still be able to read it. ## What changed - Acquire a per-thread filesystem lock when creating or resuming a paginated thread, and retain it for the lifetime of the live recorder. - Reject a competing `thread/resume` request with JSON-RPC error `-32600` and release ownership when the writer is discarded, deleted, or shut down. - Remove stale lock files without disturbing active writers. ## Testing Added coverage for competing processes, ownership transfer after shutdown, stale-lock cleanup, and lock release during discard and deletion. GitOrigin-RevId: 81d49a2fffc73ba8135752b4944f27feafa4c0d6
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Enforce single-writer ownership for paginated threads
Why
Only one app-server process should keep a paginated thread open for writing at
a time, while other processes must still be able to read it.
What changed
thread, and retain it for the lifetime of the live recorder.
thread/resumerequest with JSON-RPC error-32600andrelease ownership when the writer is discarded, deleted, or shut down.
Testing
Added coverage for competing processes, ownership transfer after shutdown,
stale-lock cleanup, and lock release during discard and deletion.