Propose plan

Propose *how* you intend to tackle a task before doing the work, and wait for a human to approve it. Posts your plan (markdown) as a comment and sets status to plan_proposed, which drops the task out of your ready queue (list_my_tasks) until a human approves (→ back to in_progress, with plan_approved_at stamped as your go-ahead) or rejects (→ back to not_started, with feedback to re-plan) it in the app. Use this for substantial or ambiguous work where the human should sign off on the approach before you spend effort — the pre-execution counterpart to propose_completion. Pass steps to materialize the plan as real subtasks right away (same mechanism as decompose_task) instead of leaving it as prose only a human has to manually turn into tasks later — render_plan and the app both read these subtasks, so this is what makes the checklist/progress view work. A step's assignee defaults to unset (nobody's queue) even if you write "I'll do this" in the plan text — set assignee:"claude" explicitly on the steps you intend to execute yourself, otherwise get_task/list_my_tasks won't know they're yours.