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/VERDICT.md

@@ -1,27 +0,0 @@
-# Verdict: fix-can-edit-path-prefix
-
-## Status: PASS
-**Completion Date**: 2026-06-22
-
-## Summary
-The fix correctly prevents sibling-directory bypass at all 5 locations in status.py. All tests pass.
-
-## Findings
-- `str(file_path).startswith(proj_str + os.sep) or str(file_path) == proj_str` correctly handles path boundaries.
-- All 5 affected locations use the same consistent pattern.
-- Bug Finder found no bugs. Adversarial Bug Finder confirmed no issues with symlinks, trailing slashes, or case sensitivity.
-- No contradictions between the two reports.
-- Test coverage added: `TestCanEditPathPrefix` (3 tests covering sibling rejection, subdirectory acceptance, and can-edit-task).
-- All 242 tests pass.
-
-## Tasks for Review / Tie-Breaks
-None.
-
-## Remaining Issues
-None.
-
-## Score
-+10 (PASS)
-
-## Reviewer Comments
-