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/harden-dashboard-security-scripts/VERDICT.md

@@ -0,0 +1,20 @@
+# Verdict: Harden Dashboard Security and Fix Scripts
+
+## Status: PASS
+**Completion Date**: 2026-06-14
+
+## Summary
+Dashboard static file serving now uses a robust path containment check, task names are strictly validated, `update.sh` protects against overwriting local changes, and repository URLs point to the real Gitea instance.
+
+## Findings
+- Path traversal check uses `Path.relative_to()`.
+- Task name regex rejects special characters and path separators.
+- `update.sh` aborts on uncommitted changes.
+- README and install script contain the real Gitea URL.
+- Atomic-write guidance added to `.rules.md`.
+
+## Remaining Issues
+None.
+
+## Score
++10 PASS