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/BUG_REPORT.md

@@ -0,0 +1,16 @@
+# Bug Report: fix-can-edit-path-prefix
+
+## Summary
+The fix correctly prevents sibling-directory bypass at all 5 locations in status.py.
+
+## Bugs Found
+No bugs found.
+
+## Verification
+- `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.
+- All 5 locations use the same consistent pattern.
+- `Path.resolve()` is called on `file_path`, so symlinks are resolved before comparison.
+- 3 tests pass: sibling-rejection, subdirectory-acceptance, can-edit-task.
+
+## Score
+0