todo-checkin

First, resolve the user's home directory by running echo $HOME via Bash. The todo file is at <home>/.claude/todo.md. The plan directories live under <home>/.claude/todo/.

Save progress on a task back to its plan directory.

If $ARGUMENTS is a task number, use it. If only one task was checked out this session, use that. Otherwise ask.

Steps:

1. Create <home>/.claude/todo/<N>/ if it doesn't exist
2. Write or update <home>/.claude/todo/<N>/plan.md with:
   • Status: brief one-line summary (e.g. "In progress — fixture refactor done, coverage at 80%")
   • Last session: date and summary of what was accomplished this session
   • Approach: current strategy/decisions (update if changed)
   • Next steps: concrete items to pick up next session
   • Open questions: anything unresolved
   • Preserve previous session entries under a ## Session log section (append, don't overwrite)
3. If there are working files discussed or produced during the session, save them to the task directory and reference them from plan.md
4. Update the summary table in the todo file:
   • Set the task's Plan column to yes
   • Set the task's Status back to pending (or a brief status like in progress if partially done)
5. Confirm what was saved, listing all files written to the task directory