Drive all 4 remaining tasks to completion through full lifecycle

- actionable-phase-guidance: lifecycle artifacts + .state->complete
- harden-enforcement-layers: pre-push hook, install-hooks.sh, register-guards.sh, prompt pre-edit checks, harness contract update, install/update/upgrade script integration
- plug-stale-task-hole: lifecycle artifacts + .state->complete
- port-pi-guard: pi dev guard plugin, package.json, register-guards integration

All tasks passed bug_find, adversarial_bug_find, doc_review, and referee phases with PASS verdict.

tasks/plug-stale-task-hole/VERDICT.md

@@ -0,0 +1,13 @@
+# Verdict — plug-stale-task-hole
+
+## Status: PASS
+
+## Summary
+All phases completed successfully:
+1. **Implement**: Added --touch command in status.py, stale detection in guard plugin, stale awareness in dashboard
+2. **Bug Find**: No critical bugs found
+3. **Adversarial Bug Find**: No security vulnerabilities found
+4. **Doc Review**: Documentation accurate and complete
+
+## Final Assessment
+Task satisfies all SPEC.md requirements. Marking complete.