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gsxdsm 844512ed3e FN-8976: prevent concurrent automatic validator runs

Prevent automatic validation from running alongside a fresh manual or non-memoized validator.

- Serialize validator admission around a feature-scoped fresh-running check.

- Report feature-versus-fingerprint blocking scope and preserve memoization semantics.

- Add regression coverage, documentation, and a patch changeset.

Files changed:

 .changeset/fn-8976-validator-admission.md          |   7 ++
 docs/missions.md                                   |   4 +-
 .../__tests__/postgres/mission-store.pg.test.ts    | 110 +++++++++++++++++++--
 .../core/src/async-stores/async-mission-store.ts   |  61 ++++++++++--
 packages/core/src/missions/mission-types.ts        |   2 +
 .../src/__tests__/mission-execution-loop.test.ts   |  10 +-
 6 files changed, 171 insertions(+), 23 deletions(-)

Fusion-Task-Id: FN-8976
Fusion-Task-Lineage: 61b487e8-5542-4cce-94f7-58d5295fe177
Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-08-10 22:57:21 -07:00