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/fix-dashboard-read-state/DOC_REVIEW.md

@@ -0,0 +1,12 @@
+# Doc Review: fix-dashboard-read-state
+
+## Documentation Impact
+No documentation changes needed. The fix is internal to the dashboard's state inference logic.
+
+## Checklist
+- [x] No new API endpoints or UI changes
+- [x] AGENTS.md unchanged — dashboard section still accurate
+- [x] README.md dashboard section unchanged
+- [x] CHANGELOG.md will be updated for the release
+
+## Verdict: PASS