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gsxdsm 1aa1516023 FN-8692: harden mission validator assertion matching

Make validator assertion identity handling explicit and fail closed for ambiguous legacy responses.

- Include authoritative assertion IDs in validator prompts
- Recover only unique exact-count legacy results positionally
- Reject duplicate unknown and empty assertion IDs with regression coverage
- Document the assertion identity contract and add a patch changeset

Files changed:
 .changeset/fn-8692-validator-assertion-ids.md      |   7 +
 docs/missions.md                                   |   2 +-
 .../src/__tests__/mission-execution-loop.test.ts   | 142 ++++++++++++++++++++-
 packages/engine/src/mission-execution-loop.ts      |  70 ++++++++--
 4 files changed, 204 insertions(+), 17 deletions(-)

Fusion-Task-Id: FN-8692

Fusion-Task-Lineage: 973c65e9-962f-472b-8d42-aef1de830d70

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

2026-08-01 09:18:49 -07:00