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/port-pi-guard/VERDICT.md

@@ -0,0 +1,13 @@
+# Verdict — port-pi-guard
+
+## Status: PASS
+
+## Summary
+All phases completed successfully:
+1. **Implement**: Created pi dev guard plugin at plugins/automaton-guard-pi/ with full ExtensionAPI integration
+2. **Bug Find**: No critical bugs found
+3. **Adversarial Bug Find**: No security vulnerabilities found
+4. **Doc Review**: Documentation accurate and complete
+
+## Final Assessment
+Task satisfies all SPEC.md requirements. Marking complete.