fusion/.changeset/fn-4656-finalize-integrity-gate.md

@runfusion/fusion

@runfusion/fusion
patch

Finalize-to-done now requires ownership evidence: tasks only complete when a task-owned landed commit is proven or when no-op completion is proven against the merge target. Legitimate no-op finalize paths now reconcile stale metadata by clearing inherited modifiedFiles and stamping empty landedFiles markers. Unproven finalize cases are audit-logged and auto-retried by requeuing to todo for fresh execution instead of silently landing as done.