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/ADVERSARIAL_BUG_REPORT.md

@@ -0,0 +1,12 @@
+# Adversarial Bug Report: fix-test-plan-phase-mapping
+
+## Attack Vectors Tested
+1. **Task with both TEST_PLAN.md and IMPLEMENTATION.md**: IMPLEMENTATION.md is checked first in both status.py and task.py, so it correctly maps to `code_review` — no regression
+2. **Task with TEST_PLAN.md only**: Maps to `test_design` — correct
+3. **Task with TEST_PLAN.md and CODE_REVIEW.md**: CODE_REVIEW.md checked first → `bug_find` — correct
+4. **Case sensitivity of filenames**: Artifact check uses exact string match — `test_plan.md` (lowercase) would not match `TEST_PLAN.md` — this is existing behavior, not a new issue
+
+## Findings
+No bugs found.
+
+## Verdict: PASS