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/task-status-reason/VERDICT.md

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+# Verdict: task-status-reason
+
+## Status: PASS
+**Completion Date**: 2026-06-14
+
+## Summary
+Added status_reason to Task model with human-readable explanations for each state, fixed pending review count to exclude terminal-state tasks, and replaced approve/request-changes buttons with revoke buttons on submitted reviews.
+
+## Findings
+- All 156 tests pass (5 new status_reason tests)
+- status_reason covers all 10+ task states with specific messages derived from artifacts
+- Backend accepts "pending" as review status for revocations
+- Pending count now only shows non-terminal tasks needing review
+
+## Tasks for Review / Tie-Breaks
+- None
+
+## Score
++10