# SPEC: move-completed-tasks-to-complete-folder

## Context

When a task transitions to `complete`, its directory remains in `tasks/<name>/` alongside active tasks. This clutters `--list` and `--audit`. The fix: move completed task directories to `tasks/complete/<name>/` when `--transition complete` is called.

## Requirements

### R1 -- `_task_dir` fallback

Modify `_task_dir(task_name, project)` in `scripts/status.py` to check `tasks/complete/<name>` as a fallback when `tasks/<name>` doesn't exist:

```python
task_path = base / task_name
if not task_path.exists():
    completed = base / "complete" / task_name
    if completed.exists():
        return completed
return task_path
```

This ensures `--task <name>`, `--transition`, `--approve`, and other commands that call `_task_dir` still work for completed tasks.

### R2 -- `cmd_transition` moves task directory

After `_write_state(task_path, target)` in `cmd_transition`, add: if `target == "complete"`, compute the tasks root directory and move `task_path` to `tasks/complete/<name>/`. Create `tasks/complete/` if it doesn't exist. Print a message confirming the move.

### R3 -- `_all_task_dirs` unchanged

Do NOT scan `tasks/complete/` in `_all_task_dirs`. Completed tasks are out of sight from `--list` and `--audit`.

### R4 -- Tests

Write `tests/test_move_completed.py` covering:
1. `test_complete_moves_dir` -- simulate `--transition complete` on a task, verify the dir moves to `tasks/complete/<name>/`.
2. `test_task_dir_fallback` -- verify `_task_dir` returns the completed path when task is in `tasks/complete/`.
3. `test_all_task_dirs_excludes_completed` -- verify `_all_task_dirs` does NOT include completed tasks.
4. `test_create_task_refuses_completed` -- verify `--create-task` with the same name as a completed task is refused.
5. `test_transition_refuses_from_complete` -- verify `--transition` from `complete` is refused.
6. `test_complete_dir_created_on_first_move` -- verify `tasks/complete/` is created if it doesn't exist.

### R5 -- Documentation

- `CHANGELOG.md` under `[unreleased]`

## Verification

- `python3 -m py_compile scripts/status.py`
- `python3 -m pytest tests/test_move_completed.py -v`
- `python3 -m pytest tests/ -q` -- full suite green