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/fix-test-plan-phase-mapping/VERDICT.md

@@ -1,13 +0,0 @@
-# Verdict: fix-test-plan-phase-mapping
-
-## Status: PASS
-
-## Summary
-Fixed TEST_PLAN.md phase mapping from `implement` to `test_design` in both `status.py:_infer_state_from_artifacts()` and dashboard `task.py:determine_task_state()`. Tests updated to assert correct mapping. No regressions — tasks with both TEST_PLAN.md and IMPLEMENTATION.md still correctly map to `code_review`.
-
-## Artifacts
-- IMPLEMENTATION.md: Complete
-- CODE_REVIEW.md: PASS
-- BUG_REPORT.md: No bugs found
-- ADVERSARIAL_BUG_REPORT.md: No bugs found
-- DOC_REVIEW.md: PASS