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/project-migration/BUG_REPORT.md

@@ -0,0 +1,18 @@
+# Bug Report: Project Migration Script
+
+## Methodology
+Reviewed migrate-project.sh and onboarding.md migration section.
+
+## Acceptance Criteria
+| # | Criterion | Result |
+|---|-----------|--------|
+| 1 | migrate-project.sh exists and is executable | ✅ |
+| 2 | Correctly identifies identical vs customized files | ✅ |
+| 3 | Customized files moved to extensions/ | ✅ |
+| 4 | .agent.md and .rules.md preserved | ✅ |
+| 5 | Onboarding detects stale projects | ✅ |
+
+## Findings
+1. **Minor**: Script skips symlinks with `-type f` — unlikely in practice.
+
+## Verdict: PASS