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gsxdsm 90573e31b0 FN-8963: prevent concurrent mission validation runs

Prevent duplicate manual validation runs while preserving recovery from stale validator state.

- Add atomic mission-store claims and release handling for manual validator runs.
- Return a conflict response and disable the validation action while a run is active.
- Cover concurrent claims, API behavior, UI state, and stale-window parity.

Files changed:
 .changeset/fn-8963-validate-inflight-guard.md      |   7 ++
 docs/missions.md                                   |   2 +
 .../__tests__/postgres/mission-store.pg.test.ts    | 129 +++++++++++++++++++++
 .../core/src/async-stores/async-mission-store.ts   |  87 ++++++++++++--
 packages/core/src/index.ts                         |   2 +
 packages/core/src/missions/mission-store.ts        |  69 ++++++++++-
 packages/core/src/missions/mission-types.ts        |  13 +++
 packages/dashboard/app/api/legacy.ts               |   2 +
 packages/dashboard/app/api/missions/missions.ts    |  11 +-
 .../dashboard/app/components/MissionManager.tsx    |  15 ++-
 .../MissionManager.validate-inflight.test.tsx      |  77 ++++++++++++
 .../mission-validate-inflight-guard.test.ts        |  55 +++++++++
 packages/dashboard/src/mission-routes.ts           |  32 +---
 .../src/__tests__/mission-execution-loop.test.ts   |  61 +++++++++-
 .../validator-run-stale-window-parity.test.ts      |   9 ++
 15 files changed, 549 insertions(+), 22 deletions(-)

Fusion-Task-Id: FN-8963
Fusion-Task-Lineage: 7e5d0ae4-98ac-4f79-99ca-45fd1450362d
Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-08-10 21:41:47 -07:00