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/port-pi-guard/DOC_REVIEW.md

@@ -1,14 +0,0 @@
-# Doc Review — port-pi-guard
-
-## Documentation Reviewed
-- IMPLEMENTATION.md (task folder)
-- SPEC.md
-- guard.ts header comments
-- package.json description
-- contracts/harness-integration.md (Pi Dev matrix entry)
-
-## Findings
-Documentation is accurate and complete. The guard.ts has a clear header comment describing its purpose and installation. The IMPLEMENTATION.md correctly documents the new files and integration points.
-
-## Verdict
-Documentation is satisfactory. No changes needed.