Archive completed tasks, add cleanup commands, self-documenting dashboard UI

- Archive 79 completed framework-dev tasks from tasks/ -> tasks/complete/
- status.py: add --cleanup-done and --install-cleanup-schedule commands
- Add scripts/automaton-cleanup.sh for periodic task archiving
- Dashboard: rename 'Background' tab -> 'Agent', 'Cleanup' agent -> 'Completed Task Archiver', remove redundant group headers and pill badges, dim inactive agent placeholders
- .rules.md: add Self-Documenting UI Names rule
- New tests: test_cleanup_done.py, expanded test_app.py and test_task.py

tasks/complete/dashboard-task-review/ADVERSARIAL_BUG_REPORT.md

@@ -0,0 +1,21 @@
+# Adversarial Bug Report: Dashboard Task Review and Approval
+
+## Deep Review
+The review API writes REVIEW.md to the task folder. Submissions are POST with status + comment.
+
+## Potential Issues
+1. **No authentication**: Any HTTP client can submit reviews. The dashboard is localhost-only by default, but `--host 0.0.0.0` exposes the review API without auth.
+
+2. **No CSRF protection**: POST endpoint accepts JSON from any origin. Mitigated by same-origin policy and no cookies/auth.
+
+3. **Path traversal in task name**: Task name is URL-decoded but no `../` check. An attacker could write REVIEW.md outside the tasks directory. Fixed below.
+
+4. **Comment injection**: Comment content is written directly to REVIEW.md without escaping. If REVIEW.md is ever consumed by a markdown renderer, injected markdown could be an issue.
+
+## Security Fix: Path traversal
+The `_handle_review` endpoint writes to `project_root / ".automaton" / "tasks" / task_name / self.REVIEW_FILE`. If task_name contains `../`, the review file could be written outside the tasks directory. Add a path traversal check.
+
+## Security Fix Applied
+Added path traversal validation to task name in _handle_review and _get_review_status.
+
+## Verdict: PASS (with security fix applied)