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/DOC_REVIEW.md

@@ -1,12 +0,0 @@
-# Doc Review: fix-can-edit-path-prefix
-
-## Summary
-No documentation updates needed. The `--can-edit` and `--scope-check` commands' external behavior is unchanged — only the internal path comparison logic was fixed.
-
-## Findings
-- README.md, AGENTS.md, and contracts/harness-integration.md document `--can-edit` and `--scope-check` usage but not the internal path comparison implementation.
-- The fix does not change any command-line interface, output format, or exit code.
-- No user-facing behavior change for valid use cases (only invalid sibling-directory bypass is now correctly rejected).
-
-## Verdict
-No doc changes required.