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/wire-dashboard-config/IMPLEMENTATION.md

@@ -0,0 +1,25 @@
+# Implementation: Wire DashboardConfig + Add Caching + Add Size Limits
+
+## Summary
+- Added `GET /api/config` endpoint returning `config.to_dict()`
+- Added `PUT /api/config` endpoint accepting JSON body, validating via `DashboardConfig.validate()`, and persisting to `dashboard-config.json`
+- Added server-side task cache with 1-second TTL (`_get_cached_tasks`, `_invalidate_task_cache`)
+- `_serve_tasks` and `_serve_task` now use cached task list instead of calling `discover_tasks()` on every request
+- `_serve_review_summary` uses cached task list instead of iterating filesystem
+- Writing a review (`POST /api/task/{name}/review`) invalidates cache
+- R3 (content-length bounds) already implemented in harden-dashboard-security task
+- Dashboard.js now fetches `/api/config` on init and applies `theme`, `default_view`, `column_width`, `show_timelines`, `auto_refresh_interval`
+- Removed hardcoded `setInterval(refreshData, 2000)` — refresh interval is now config-driven
+- CORS headers updated to include `PUT` method
+
+## Changes
+- `automaton/dashboard/ui/app.py`: Added `_task_cache`, `_get_cached_tasks`, `_invalidate_task_cache`, `_serve_config`, `_handle_config_update`, `do_PUT`; wired `DashboardHandler.config` class attribute; `_serve_tasks`, `_serve_task`, `_serve_review_summary` use cache; cache invalidation in `_handle_review`; CORS updated with PUT
+- `automaton/dashboard/html/dashboard.js`: Added `fetchConfig`, `applyConfig`; updated `startAutoRefresh` to accept interval; `DOMContentLoaded` now async and fetches config before starting refresh
+- `tests/test_app.py`: Added `TestTaskCache` (3 tests) and `TestConfigEndpoint` (4 tests)
+
+## Test Results
+126 passed in 0.09s
+Dashboard starts (port conflict on 8080 is environmental, not a bug)
+
+## Blockers
+None