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/actionable-phase-guidance/DOC_REVIEW.md

@@ -0,0 +1,13 @@
+# Doc Review — actionable-phase-guidance
+
+## Documentation Reviewed
+- IMPLEMENTATION.md (task folder)
+- SPEC.md
+- task.py docstrings and comments
+- dashboard.js comments
+
+## Findings
+Documentation is accurate and complete. The IMPLEMENTATION.md correctly enumerates all changed files. The SPEC.md goal ("Add actionable next-step guidance to all dashboard phases") is fully met. No documentation gaps found.
+
+## Verdict
+Documentation is satisfactory. No changes needed.