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/BUG_REPORT.md

@@ -0,0 +1,16 @@
+# Bug Report — harden-enforcement-layers
+
+## Review Scope
+Pre-push hook, install-hooks.sh, register-guards.sh, prompt modifications, contract updates, install/update/upgrade scripts, system-prompt.md.
+
+## Findings
+
+### No Critical Bugs Found
+All scripts are syntactically correct (bash). The pre-push hook correctly calls `status.py --can-edit` with `--json` flag and blocks non-zero exit codes. The install-hooks.sh properly handles missing source files. The register-guards.sh correctly detects opencode config and pi binary.
+
+### Minor Observations
+- `register-guards.sh` line 30 uses Python inline with `$OPENCODE_CONFIG` directly inside a Python string — this could break if the path contains special characters
+- `update.sh` hooks installation only runs if `git rev-parse` succeeds but doesn't check if the hook already exists (it checks `[ ! -f "$HOOK_DST" ]` which is safe)
+
+## Verdict
+No blocking bugs. Ready for adversarial review.