This is a live verification. First call the T3 tool delegate_task exactly once with mode="async", provider instance claudeAgent, model claude-sonnet-5-5, options {"effort":"low"}, and this task text verbatim: "Count from 1 to 300, one number per line. Do not use any tools." Then, as your final action in this turn, call t3_worktree_handoff with exactly these arguments: {"branch":"handoff-r1b-c3c809dc","baseRef":"main","startFromOrigin":false,"runSetupScript":false,"continuationPrompt":"Reply with the single word DONE. Do not use any tools or edit files."}. Do not call any other tool, do not run shell commands, do not read or edit files, and do not delegate. After the handoff call returns, end your turn immediately with no further text. When a completion notification for the delegated task arrives later, call task_status once for it and reply with exactly ACK: followed by its status.