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/multi-agent-support/VERDICT.md

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+# VERDICT: Multi-Agent Support
+
+
+## Status: PASS
+## Summary
+Implemented claim/release/next-available/available commands in status.py, .state.lock files for agent coordination, Agent Configuration section in .agent.md, and single-agent zero-overhead guarantee (no locks or claiming in single-agent mode).
+
+## Phase Results
+| Phase | Result |
+|-------|--------|
+| Implementation | ✅ PASS |
+| Bug Find | ✅ PASS (2 minor findings) |
+| Adversarial Bug Find | ✅ PASS |
+| Doc Review | ✅ PASS |
+
+## Findings
+- Single-agent mode has zero behavioral overhead (no locks created)
+- Claim/release with atomic writes and lock expiry
+- Work discovery with priority ordering (tasks closer to completion first)
+- Agent Configuration validates phases are covered by at least one agent
+- Completed/human_intervention tasks auto-release locks
+- Minor: Lock timeout parsing is case-sensitive
+- Minor: Agent identity is self-reported (acceptable in trusted environment)
+
+## Final Verdict
+**PASS** — All acceptance criteria met. Multi-agent support is opt-in and adds zero overhead to single-agent mode.
+
+Score: +10