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/multi-agent-support/DOC_REVIEW.md

@@ -1,14 +0,0 @@
-# Doc Review: Multi-Agent Support
-
-## Documents Checked
-| Doc | Status |
-|-----|--------|
-| SPEC.md | ✅ Complete — 366 lines covering all multi-agent features |
-| IMPLEMENTATION.md | ✅ Implementation documented |
-| .agent.md | ✅ Agent Configuration section added |
-| scripts/status.py | ✅ --claim, --release, --next-available, --available implemented |
-
-## Findings
-1. **Minor**: The Agent Configuration section in `.agent.md` is documented in the spec but the actual `.agent.md` file uses a slightly different YAML format than the spec's markdown outline. This is cosmetic — the parsing works correctly.
-
-## Verdict: PASS