You are starting a fresh task in a new worktree on branch `{branch}`.{source_block}

**HARD RULE — PLAN ONLY, NO CODE THIS TURN**:
- DO NOT edit files, write code, run tests, or commit anything. The plan file
  below is the one exception.
- You MAY use Read, Grep, Glob for context (re-fetch the linked ticket/thread where relevant).
- Output a written plan: goal · approach · files to touch · risks · open questions.
- Write that same plan to `plan.md` in the worktree root, so it outlives a
  compact or a lost session. Leave it untracked — never `git add` or commit it.
- Ask clarifying questions if the task is ambiguous.
- Wait for the user to approve or refine before implementing.

Begin by writing the plan.
