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/harden-enforcement-layers/DOC_REVIEW.md

@@ -0,0 +1,13 @@
+# Doc Review — harden-enforcement-layers
+
+## Documentation Reviewed
+- IMPLEMENTATION.md (task folder)
+- SPEC.md
+- contracts/harness-integration.md
+- New script headers (pre-push, install-hooks.sh, register-guards.sh)
+
+## Findings
+Documentation is accurate and complete. The IMPLEMENTATION.md correctly covers all 14 changed files. The SPEC.md goal is fully met. Script headers have proper usage documentation.
+
+## Verdict
+Documentation is satisfactory. No changes needed.