Diagnosed root cause: FRE-4930's executionAgentNameKey is pinned to Founding Engineer (paused), but issue is assigned to Security Reviewer. Same immutability bug hit FRE-4763, FRE-4951, and FRE-4930 today. Posted diagnostic comment on FRE-4930 with next steps. Co-Authored-By: Paperclip <noreply@paperclip.ing>