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

@@ -1,19 +0,0 @@
-# Adversarial Bug Report: fix-can-edit-path-prefix
-
-## Summary
-Adversarial review of the path prefix fix. No additional bugs found.
-
-## Bugs Found
-No bugs found.
-
-## Analysis
-- **Security — symlink bypass**: `Path(args.file).resolve()` resolves symlinks before comparison, so a symlink inside the project pointing outside would be resolved to the real path and correctly rejected. Good.
-- **Trailing slash**: The `== proj_str` clause handles the edge case where `file_path` is exactly the project directory. `Path.resolve()` strips trailing slashes, so this is robust.
-- **Case sensitivity**: On macOS (default filesystem is case-insensitive), `Path.resolve()` does not normalize case. A file at `/Users/user/Project/file.py` would not match project `/Users/user/project`. This is consistent with the original behavior and not a regression.
-- **Framework vs project**: The fix applies `os.sep` to both `proj_str` and `auto_str` checks — consistent across all 5 locations.
-- **Empty file path**: `args.file` is required by argparse for `--can-edit --file` and `--scope-check`, so empty paths are not reachable.
-
-## Score
-0
-
-ADVERSARIAL_BUG_FIND_COMPLETE