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gsxdsm 0440ae4bb9 FN-7074: make task ID reservation commits atomic

Task creation now commits or rolls back distributed task ID reservations with the task-row transaction.

- Add transaction-participating reservation commit and rollback helpers.
- Wire create, duplicate, and refinement task paths to commit reservations inside task insertion.
- Record rollback audit events and preserve burned reservation rows after failed creates.
- Cover atomicity, rollback, and allocator behavior with reservation-focused tests and docs.

Files changed:
 .changeset/fn-7074-reservation-atomicity.md        |   7 +
 AGENTS.md                                          |   1 +
 docs/architecture.md                               |   7 +-
 docs/storage.md                                    |   4 +-
 .../core/src/__tests__/distributed-task-id.test.ts |  25 ++-
 .../__tests__/store-reservation-atomicity.test.ts  | 224 +++++++++++++++++++++
 packages/core/src/distributed-task-id.ts           | 208 +++++++++++++------
 packages/core/src/store.ts                         |  93 +++++++--
 8 files changed, 479 insertions(+), 90 deletions(-)

Fusion-Task-Id: FN-7074

Fusion-Task-Lineage: 464a98cf-e903-4257-93ac-424c7129412b

2026-06-26 14:55:01 -07:00