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/task-status-reason/DOC_REVIEW.md

@@ -0,0 +1,24 @@
+# Documentation Review: task-status-reason
+
+## Summary
+No DESIGN.md. Conducting ad-hoc review of code documentation for the status_reason feature.
+
+## Documentation Completeness
+- Code documentation: Adequate — `status_reason` property has a docstring. `parse_verdict_status` was already documented. No DESIGN.md or deployment docs produced (proportional to the small change set).
+- User documentation: Not updated — the dashboard README (`automaton/dashboard/README.md`) doesn't mention the status reason display. The new status_reason field in the API response is also undocumented.
+- API documentation: No formal API docs exist for the dashboard endpoints.
+
+## Issues Found
+
+### Issue 1: Dashboard README not updated for status reason display
+- **Severity**: Low
+- **Description**: The dashboard README at `automaton/dashboard/README.md` doesn't document that the detail panel now shows a status reason. This is a user-facing UI change without documentation.
+- **Suggested Fix**: Add a note to the README under "Detail Panel" section describing the status reason.
+
+### Issue 2: CHANGELOG entry missing bug fixes
+- **Severity**: Low
+- **Description**: The CHANGELOG correctly lists the status_reason feature and revoke buttons, but doesn't mention the REFEREE state fix (a consequence of Bug 2 fix from BUG_REPORT.md).
+- **Suggested Fix**: Add a Fixed entry for the REFEREE state being unreachable.
+
+## Score
++3