fusion/.changeset/FN-4259-stuck-loop-exhaustion.md

@runfusion/fusion

@runfusion/fusion
patch

Add a deterministic terminal contract for stuck-loop retry exhaustion. Exhausted tasks are marked failed with a STUCK_LOOP_EXHAUSTED: error prefix, receive a final operator guidance log entry, and are untracked by the stuck detector so automatic kill/requeue churn does not continue until the task is manually recovered.