IndexedSessionStorage.writeTextAtomic no longer delegates directly to writeText, which yielded on #awaitPath between the guard check and the backend publish. The new impl consults the guard three times — up front, again after #awaitPath resolves, and finally inside the enqueued task immediately before #backend.writeFull — so a flushSync that bumps #diskEpoch while the atomic rewrite is suspended cannot land stale content on Redis/SQL backends. When the enqueue-time guard rejects, the optimistic index update is restored only when nothing has advanced it past our mtime, so a concurrent writer's state is preserved.
Added a PausableWriteFullBackend regression: the first writeTextAtomic parks inside backend.writeFull holding the per-path tail; the second queues with a guard that flips after the first is released. The backend records only the first content, confirming the guard is honored at publish time.
Fixes#4338
- Added regression test in `remote-compaction` to verify that concurrent v2 compaction preparation correctly reuses preserved history and avoids redundant re-expansion.
- Added mock-backend verification in `session-storage` to ensure that failed atomic title updates do not rollback newer optimistic state.
- Updated `sql-session-storage` expectations to account for the preserved fixed-width title slot header in session files.
- Expanded `remote-compaction` fetch header validation to include `x-client-request-id` assertion.
- Implemented mutable session titles with audit tracking, including storage persistence for SQL and Redis backends.
- Added comprehensive session management features such as idle recap triggers, incremental subagent yield submissions, and automated title refreshing.
- Enhanced task tracking in the TodoTool with progress prioritization and improved session cleanup logic.
- Introduced citation tag handling for OpenAI-compatible source markers and improved edit parsing.
Tail appended transcript JSONL instead of rebuilding rendered history on every poll, collapse compacted history for live chat rendering, and replace synchronous session rewrites so tailers detect historical changes.
Fixes#3258
- Migrated test mocking from bun:test mock API to vitest spyOn pattern across 9 test files.
- Extracted mock setup logic into reusable helper functions with Symbol.dispose cleanup pattern.
- Replaced manual beforeEach/afterEach and try-finally blocks with TypeScript 5.2 using declarations.
- Removed 178 lines of boilerplate mock initialization and restoration code from test suite.
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