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/task-detail-modal/VERDICT.md

@@ -1,17 +0,0 @@
-# VERDICT: Centered Modal for Task Detail
-
-
-## Status: PASS
-## Summary
-Replaced the narrow 380px side panel with a centered modal overlay (720px max-width) for task detail viewing.
-
-## Phase Results
-| Phase | Result |
-|-------|--------|
-| Implementation | ✅ PASS |
-| Bug Find | ✅ PASS |
-| Adversarial Bug Find | ✅ PASS |
-| Doc Review | ✅ PASS (1 doc finding) |
-
-## Final Verdict
-**PASS** — All acceptance criteria met.