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/DOC_REVIEW.md

@@ -0,0 +1,13 @@
+# Doc Review: Dashboard Implementation
+
+## Findings
+
+### Finding 1: Missing
+- **Issue**: README.md doesn't document the filter bar keyboard shortcuts
+- **Impact**: Low - users won't know how to use filters
+- **Fix**: Add filter bar shortcuts to README
+
+### Finding 2: Missing
+- **Issue**: README.md doesn't explain how scope detection works
+- **Impact**: Low - users won't know the difference between framework and project mode
+- **Fix**: Add scope detection explanation to README