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-can-edit-path-prefix/CODE_REVIEW.md

@@ -0,0 +1,15 @@
+# Code Review: fix-can-edit-path-prefix
+
+## Summary
+Fixes path prefix matching at 5 locations to prevent sibling-directory bypass.
+
+## Findings
+- **Correctness**: `str(file_path).startswith(proj_str + os.sep) or str(file_path) == proj_str` correctly handles both files inside the directory and the directory itself. The `os.sep` ensures the boundary is a path separator, preventing `/home/user/project-evil` from matching `/home/user/project`.
+- **Consistency**: All 5 locations use the same pattern — good.
+- **Edge cases**: 
+  - A file exactly at `proj_str` (the project root itself) is handled by the `== proj_str` clause.
+  - Symlinks: `Path.resolve()` is called on `file_path`, so symlinks are resolved before comparison. This is correct.
+- **Tests**: 3 tests cover the sibling-rejection, subdirectory-acceptance, and can-edit-task scenarios.
+
+## Verdict
+APPROVED — no issues found.