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/fix-test-plan-phase-mapping/DOC_REVIEW.md

@@ -1,12 +0,0 @@
-# Doc Review: fix-test-plan-phase-mapping
-
-## Documentation Impact
-No documentation changes needed. The phase mapping fix aligns the code with the documented workflow (TEST_PLAN.md is produced during test_design phase, not implement).
-
-## Checklist
-- [x] AGENTS.md LEGAL_TRANSITIONS already show `test_design` → `implement` (TEST_PLAN.md is test_design output)
-- [x] prompts/workflow.md phase descriptions already correct
-- [x] No user-facing documentation referenced the old (buggy) mapping
-- [x] CHANGELOG.md will be updated for the release
-
-## Verdict: PASS