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gsxdsm 74d37785d2 FN-7069: reconcile phantom task reservations

Harden task-store startup and maintenance against phantom committed task reservations.

- Reconcile committed reservation phantoms without freeing reserved task IDs.
- Prune orphaned child rows and emit durable run-audit evidence.
- Normalize missing legacy task.json reads to clean not-found errors.
- Cover archive/search and phantom-reservation reconciliation behavior with tests.

Files changed:
 .changeset/fn-7069-phantom-task-reconcile.md       |   7 +
 AGENTS.md                                          |   1 +
 docs/architecture.md                               |   2 +
 .../src/__tests__/store-archive-search.test.ts     |   5 +
 .../store-phantom-reservation-reconcile.test.ts    | 148 +++++++++++++++++++++
 packages/core/src/store.ts                         | 106 ++++++++++++++-
 packages/engine/src/self-healing.ts                |  14 ++
 7 files changed, 282 insertions(+), 1 deletion(-)

Fusion-Task-Id: FN-7069

Fusion-Task-Lineage: 772aad37-db30-4310-a968-c6e5306c73bb

2026-06-26 13:39:33 -07:00