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/CODE_REVIEW.md

@@ -1,19 +0,0 @@
-# Code Review: fix-test-plan-phase-mapping
-
-## Reviewed Files
-- `scripts/status.py` (line 348-349: `_infer_state_from_artifacts()`)
-- `automaton/dashboard/core/task.py` (line 548-549: `determine_task_state()`)
-- `tests/test_task.py`
-
-## Changes
-Changed `TEST_PLAN.md` mapping from `implement` → `test_design` in both `status.py` and dashboard `task.py`.
-
-## Analysis
-- **Correctness**: `TEST_PLAN.md` is produced during the `test_design` phase, not `implement`. The workflow is: `test_design` → (approval) → `implement`. TEST_PLAN.md is the output of `test_design`, so it should map to `test_design`.
-- **Consistency**: Both `status.py` and dashboard `task.py` now use the same mapping
-- **Test updates**: Existing tests updated to assert `TEST_DESIGN` instead of `IMPLEMENT`, and new test added for `--upgrade` inference
-- **No regression**: Tasks with both TEST_PLAN.md and IMPLEMENTATION.md still correctly map to `code_review` (because IMPLEMENTATION.md is checked first)
-
-## Verdict: PASS
-
-The fix is correct, minimal, and consistent across both enforcement and dashboard code.