# Fix status.py Bugs

## Problem
1. **Neutered target-phase artifact check** (status.py:488-492): loop body is `pass`, check never executes
2. **Double `continue`** (status.py:1003-1004, 1057-1058): unreachable dead code
3. **`cmd_approve` uses `_read_state`** (status.py:521): weaker than `_require_state`, silently handles untracked tasks
4. **No `--list-states` command**: agents can't discover valid phases programmatically

## Fix
1. Activate target-phase artifact check (remove `pass`, add actual validation)
2. Remove duplicate `continue` statements
3. Change `cmd_approve` to use `_require_state` for consistency
4. Add `--list-states` argument that prints VALID_PHASES

## Verification
- Target-phase artifact check blocks transitions when target's required artifact is missing
- No dead code
- `cmd_approve` rejects untracked tasks
- `--list-states` prints all valid phases