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/implement-task/IMPLEMENTATION.md

@@ -0,0 +1,16 @@
+# Implementation: Dashboard
+
+## Summary
+The dashboard has been implemented with all core features.
+
+## Changes
+- Created core modules: scope, task, board, stats, timeline, refresh
+- Created UI components: header, board, card, detail_panel, stats_view, timeline_view, filter_bar, search_bar
+- Created main application: app.py
+- Created configuration management: config.py
+- Created color themes: themes.py
+
+## Tests
+- Dashboard renders correctly for all views
+- Task discovery works with various artifact combinations
+- Scope detection works for framework and project modes