fix(api): widen the cancel-execution reason contract to what the route emits - #6592

Bugbot Analysis Progress (3m 9s elapsed)

✅ Gathered PR context (8s)
✅ Completed bug detection (3m 1s)
✅ Posted analysis results (1s)

Final Result: Bugbot completed review - no issues found! ✅

Request ID: serverGenReqId_68d49341-a379-4da1-adad-6c11bd8128f6