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gsxdsm bb17baaacf FN-8768: recover planning handoffs after dependency reseeds

Prevent dependency reseeds from leaving completed planning work without a dispatchable continuation.

- Serialize dependency invalidation with workflow claims and retire only pending continuations.
- Persist dispatch-deduplication state and recover legacy reseeded planning handoffs safely.
- Add PostgreSQL migration, integration coverage, architecture guidance, and a patch changeset.

Files changed:
 .changeset/fn-8768-planning-reseed.md              |   7 ++
 docs/architecture.md                               |  10 +-
 .../core/src/__test-utils__/pg-test-harness.ts     |   8 ++
 .../__tests__/postgres/backend-resolver.test.ts    |   5 +
 .../src/__tests__/postgres/schema-applier.test.ts  |  17 ++-
 .../postgres/task-dependency-mutation.pg.test.ts   |  42 ++++++-
 .../__tests__/task-update-lanes-resolved.test.ts   |  20 +++-
 packages/core/src/postgres/advisory-locks.ts       | 122 +++++++++++++++++++++
 packages/core/src/postgres/backend-resolver.ts     |  13 ++-
 packages/core/src/postgres/data-layer.ts           |   4 +
 packages/core/src/postgres/embedded-lifecycle.ts   |   6 +
 .../migrations/0043_fn8768_dispatch_dedupe.sql     |  17 +++
 packages/core/src/postgres/schema-applier.ts       |  13 ++-
 packages/core/src/postgres/schema/project.ts       |  15 +++
 packages/core/src/store.ts                         |  56 +++++++++-
 packages/core/src/task-store/audit-ops.ts          |  49 +++++++++
 .../core/src/task-store/branch-and-pr-entities.ts  |  30 +++++
 packages/core/src/task-store/project-store-ops.ts  |  55 ++++++++--
 packages/core/src/task-store/task-update.ts        |  30 ++++-
 packages/core/src/task-store/update-task-deps.ts   |  30 ++++-
 packages/engine/src/__tests__/triage.test.ts       |  66 ++++++++++-
 packages/engine/src/execution/hold-release.ts      |  45 ++++++++
 packages/engine/src/scheduler.ts                   |   3 +-
 packages/engine/src/triage.ts                      |  87 ++++++++++++++-
 24 files changed, 713 insertions(+), 37 deletions(-)

Fusion-Task-Id: FN-8768

Fusion-Task-Lineage: 539ef649-5a13-4eaa-a695-bc68370fed22

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

2026-08-03 19:31:03 -07:00