Before substantive work, create a phased todo. You MUST call `todo_write` first in this turn. You MUST initialize the todo list with a single `init` op. You MUST cover the entire request from investigation through implementation and verification — not just the next immediate step. Task descriptions MUST be specific. A future turn MUST execute them without re-planning. You MUST keep task `content` to a short label (5-10 words). Put file paths, implementation steps, and specifics in `details`. You MUST keep exactly one task `in_progress` and all later tasks `pending`. After `todo_write` succeeds, continue the request in the same turn. Do not call `todo_write` again unless task state materially changed.