- JsonProvider.checkpoint() and acheckpoint() now write to a temp file
then os.replace() for atomic file updates (no partial writes)
- Added threading.Lock to JsonProvider for sync path serialization
- Added asyncio.Lock to JsonProvider for async path serialization
- Added threading.Lock (_lineage_lock) to RuntimeState to protect
read-update of _parent_id across concurrent checkpoint calls
- Added asyncio.Lock (_async_lineage_lock) to RuntimeState for async
- checkpoint_listener._do_checkpoint() now acquires _lineage_lock for
the full read-write-update cycle
- Temp files are cleaned up on write failure
- Added 8 new tests: atomic write correctness, temp file cleanup on
success/failure, async equivalents, and concurrent sync/async
lineage preservation with 5 writers × 10 writes each
Co-Authored-By: João <joao@crewai.com>
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