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/plug-stale-task-hole/BUG_REPORT.md

@@ -0,0 +1,16 @@
+# Bug Report — plug-stale-task-hole
+
+## Review Scope
+status.py --touch command, guard plugin stale detection, task.py stale awareness, test coverage.
+
+## Findings
+
+### No Critical Bugs Found
+The `--touch` command properly resets the activity clock by updating the task's mtime or recording a timestamp. The guard plugin correctly parses `stale_task` and `stale_minutes` from the JSON response. Tests cover the stale detection and touch reset flows.
+
+### Minor Observations
+- The stale detection threshold (30 minutes) is hardcoded rather than configurable
+- The guard plugin only checks stale status for the current task, not across all tasks
+
+## Verdict
+No blocking bugs. Ready for adversarial review.