fusion

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gsxdsm 28878d8125 FN-8206: validate landed merge checkout

Validate mission assertions against the delivered merge revision rather than an ambient working branch.

- Materialize and dispose a detached checkout at mergeDetails.commitSha for validator sessions.
- Defer failed validation when landed-code ancestry cannot be proven, preventing spurious fix features.
- Link validator runs to their board tasks and document the inspection behavior.

Files changed:
 .changeset/fn-8206-mission-validator-inspection-root.md   |   7 +
 docs/missions.md                                          |   2 +
 packages/engine/src/__tests__/mission-execution-loop.test.ts | 278 +++++++++++++--------
 packages/engine/src/mission-execution-loop.ts             | 160 ++++++++----
 4 files changed, 298 insertions(+), 149 deletions(-)

Fusion-Task-Id: FN-8206

Fusion-Task-Lineage: dfd1eb21-fcdf-4722-acb8-416750f4f40b

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

2026-07-17 10:00:18 -07:00