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-test-plan-phase-mapping/BUG_REPORT.md

@@ -0,0 +1,9 @@
+# Bug Report: fix-test-plan-phase-mapping
+
+## Scope
+Reviewed `scripts/status.py` and `automaton/dashboard/core/task.py` for TEST_PLAN.md phase mapping.
+
+## Findings
+No bugs found. Both locations now correctly map TEST_PLAN.md to `test_design`. Tasks with both TEST_PLAN.md and IMPLEMENTATION.md still correctly map to `code_review` (IMPLEMENTATION.md checked first).
+
+## Verdict: PASS