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/review-textarea/ADVERSARIAL_BUG_REPORT.md

@@ -0,0 +1,9 @@
+# Adversarial Bug Report: Inline Comment Textarea for Review
+
+## Deep Review
+Textarea value is read with `.value`, sent as JSON, and stored directly in REVIEW.md.
+
+## Potential Issues
+1. **No input sanitization**: Comment text is stored raw. If REVIEW.md is later parsed by markdown renderer, injection possible. Acceptable risk — REVIEW.md is a structured data file, not a rendered document.
+
+## Verdict: PASS