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/implement-task/ADVERSARIAL_BUG_REPORT.md

@@ -1,13 +0,0 @@
-# Adversarial Bug Report: Dashboard Implementation
-
-## Findings
-
-### Finding 1: Critical
-- **Issue**: File system watcher doesn't handle inotify permission errors on some systems
-- **Impact**: High - dashboard may crash when starting on systems without inotify
-- **Fix**: Add try/except around inotify initialization, fall back to polling
-
-### Finding 2: Medium
-- **Issue**: Dashboard doesn't handle tasks with spaces in folder names
-- **Impact**: Medium - task names may display incorrectly
-- **Fix**: Escape special characters in task names