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/fix-dashboard-cors-origin/VERDICT.md

@@ -0,0 +1,13 @@
+# Verdict: fix-dashboard-cors-origin
+
+## Status: PASS
+
+## Summary
+Removed wildcard CORS headers (`Access-Control-Allow-Origin: *`) from dashboard API responses. Replaced with security headers (`X-Content-Type-Options: nosniff`, `X-Frame-Options: DENY`). Tests updated to verify absence of CORS headers and presence of security headers.
+
+## Artifacts
+- IMPLEMENTATION.md: Complete
+- CODE_REVIEW.md: PASS
+- BUG_REPORT.md: No bugs found
+- ADVERSARIAL_BUG_REPORT.md: No bugs found
+- DOC_REVIEW.md: PASS