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/reconcile-dashboard-spec/VERDICT.md

@@ -1,18 +0,0 @@
-# Verdict: Reconcile Dashboard Spec with Web Implementation
-
-## Status: PASS
-**Completion Date**: 2026-06-14
-
-## Summary
-The dashboard specification now matches the implemented web dashboard. Documentation and help modal shortcuts are consistent, and the unused TUI theme module has been removed.
-
-## Findings
-- `tasks/dashboard-spec.md` rewritten for web dashboard.
-- README and help modal agree on keyboard shortcuts.
-- `themes.py` removed.
-
-## Remaining Issues
-None.
-
-## Score
-+10 PASS