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-cat3-audit-paths/SPEC.md

@@ -0,0 +1,14 @@
+# Spec: fix-cat3-audit-paths
+
+## Problem
+`_audit_category3()` in `scripts/status.py:696` checks if changed files are inside task folders using `parts[0] == "tasks"`. This only works for the framework directory (`~/.automaton/`) where git paths are `tasks/mytask/...`. For regular projects, task files have git paths like `.automaton/tasks/mytask/SPEC.md`, where `parts[0]` is `.automaton`, not `tasks`. All task-folder changes are incorrectly flagged as unauthorized.
+
+## Fix
+Update the path check at `scripts/status.py:696` to handle both cases:
+- Framework mode: `parts[0] == "tasks" and parts[1] in task_names`
+- Regular project: `len(parts) >= 3 and parts[0] == ".automaton" and parts[1] == "tasks" and parts[2] in task_names`
+
+## Acceptance Criteria
+- `--audit` on a regular project with changes inside `.automaton/tasks/` does NOT flag them as unauthorized
+- `--audit` on the framework directory still works correctly
+- Add a test in `tests/test_status.py` covering the regular-project path check