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/IMPLEMENTATION.md

@@ -0,0 +1,22 @@
+# Implementation: fix-test-plan-phase-mapping
+
+## Bug
+Both `status.py:_infer_state_from_artifacts()` and the dashboard's `determine_task_state()` mapped `TEST_PLAN.md` to the `implement` phase. But `TEST_PLAN.md` is produced during the `test_design` phase, not `implement`. This caused:
+- `--upgrade` to bootstrap incorrect `.state` for tasks with TEST_PLAN.md
+- Dashboard to show `IMPLEMENT` instead of `TEST_DESIGN` for tasks that have a test plan but no implementation yet
+
+## Fix
+Changed the mapping in both locations:
+1. `scripts/status.py:348-349`: `TEST_PLAN.md` → `test_design` (was `implement`)
+2. `automaton/dashboard/core/task.py:548-549`: `TEST_PLAN.md` → `TaskState.TEST_DESIGN` (was `TaskState.IMPLEMENT`)
+
+## Files Changed
+- `scripts/status.py` (line 348-349): Changed return value from `"implement"` to `"test_design"`
+- `automaton/dashboard/core/task.py` (line 548-549): Changed return from `TaskState.IMPLEMENT` to `TaskState.TEST_DESIGN`
+- `tests/test_task.py`: Updated `test_implementation_from_test_plan` and `test_test_plan_shows_implement` to assert `TEST_DESIGN` instead of `IMPLEMENT`
+
+## Tests
+- `test_implementation_from_test_plan`: Now asserts `TaskState.TEST_DESIGN`
+- `test_test_plan_shows_test_design` (renamed from `test_test_plan_shows_implement`): Asserts `TaskState.TEST_DESIGN`
+- `test_test_plan_maps_to_test_design` in `test_status.py`: Verifies `--upgrade` infers `test_design` for TEST_PLAN.md
+- All 249 tests pass