## Related Issues
N/A
## Summary of Changes
Reject system-bucket incarnation lookups before entering the pool metadata owner. Keep each selected scanner backlog publication cohort in one task so waiter cancellation cannot abandon its remaining serialized conditional writes. Bind repair and replay fixtures to persisted bucket incarnations.
## Verification
Head f6d44603fc received an approval from houseme in review 5365588011. This merge does not add a local runtime validation claim. Full main CI remains a separate publication gate.
## Impact
System metadata writes avoid recursive pool locking. Publication retains per-replica conditional writes and stops a cancelled caller from advancing to its next publication phase. Fixture changes supply the identities required by existing repair admission rules.
## Additional Notes
Reverting this change restores the previous behavior.
Chris
88d03d8199