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gsxdsm f2d68939be FN-9138: guard same-millisecond approval audit ID collisions

Validate that lifecycle guards prevent duplicate deterministic approval audit IDs during concurrent writes.

- Add database-free coverage for losing and successful guarded approval transitions.
- Add PostgreSQL overlap probes for decisions, completions, and physical ID uniqueness.
- Document the deterministic audit identity and lifecycle ordering guarantees.

Files changed:
 docs/storage.md                                    |   2 +-
 .../approval-request-audit-id-race.test.ts         | 115 ++++++++++++++++++
 .../postgres/approval-request-lifecycle.pg.test.ts | 132 ++++++++++++++++++++-
 .../async-stores/async-approval-request-store.ts   |  10 ++
 4 files changed, 253 insertions(+), 6 deletions(-)

Fusion-Task-Id: FN-9138

Fusion-Task-Lineage: ccfc084f-2cd8-4549-8a42-242167139b8d

Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-08-16 17:07:40 -07:00