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/BUG_REPORT.md

@@ -0,0 +1,26 @@
+# Bug Report: Multi-Agent Support
+
+## Methodology
+Reviewed claim/release/next-available/available commands, .state.lock files, Agent Configuration in .agent.md, and single-agent zero-overhead guarantee.
+
+## Acceptance Criteria
+| # | Criterion | Result |
+|---|-----------|--------|
+| 1 | Single-agent mode has zero behavioral change | ✅ |
+| 2 | `--claim` creates `.state.lock` atomically | ✅ |
+| 3 | `--claim` refuses if already claimed (non-expired) | ✅ |
+| 4 | `--claim` overclaims if expired | ✅ |
+| 5 | `--release` removes `.state.lock` | ✅ |
+| 6 | `--release` refuses if wrong agent | ✅ |
+| 7 | `--next-available` finds highest-priority unclaimed task | ✅ |
+| 8 | `--available` lists all unclaimed tasks for agent role | ✅ |
+| 9 | Agent Configuration in `.agent.md` activates multi-agent | ✅ |
+| 10 | `.state.lock` excluded from `--validate-folder` | ✅ |
+| 11 | Completed tasks auto-release locks | ✅ |
+
+## Findings
+1. **Minor**: Lock timeout defaults to 30 minutes. The configurable timeout parsing (`5m`, `10m`, etc.) from `.agent.md` works but is case-sensitive — `30M` would not be parsed correctly. Minor UX issue.
+
+2. **Minor**: The `--as-coordinator` flag and `--force` flag for coordinator override are parsed but the coordinator role validation is limited — any agent can potentially pass `--agent orchestrator` without verification. This is acceptable since agent identity is self-reported in the current design.
+
+## Verdict: PASS