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/port-pi-guard/BUG_REPORT.md

@@ -1,16 +0,0 @@
-# Bug Report — port-pi-guard
-
-## Review Scope
-Pi dev guard plugin (guard.ts, package.json), integration in register-guards.sh and harness-integration.md.
-
-## Findings
-
-### No Critical Bugs Found
-The guard.ts properly implements the pi ExtensionAPI pattern with `pi.on("tool_call", ...)`. It correctly intercepts edit/write/bash tools, calls status.py, and returns block responses. The fallback to allowing when status.py is unavailable is reasonable (fail-open for offline scenarios).
-
-### Minor Observations
-- Lines 38-40 contain unreachable dead code (the import is shadowed by the child_process import below)
-- The bash tool regex check (`\b(write|tee|cp|mv|sed\b.*-i|dd\b.*of=)\b`) could miss some write patterns
-
-## Verdict
-No blocking bugs. Ready for adversarial review.