feat(P3): plan-JSON policies + meta-orchestration + pipeline wiring (REQ-300..303)

plan-json/ policies (3): forbid-plaintext-secrets (ports CKV_AWS_41/45/46),
forbid-iam-wildcard (ports CKV_AWS_1/40), require-kms-reference (ports
CKV_AWS_7/33) over terraform show -json output.

meta/ policies (2): block-on-any-critical (declarative source of truth for
critical-block; confidence_signal hard-override stays as defense-in-depth,
D-119) + tagging-rules-agree (cross-checks Checkov NOVA_TAG_NAMING vs kj
KJ_REQUIRE_TAGGING_STANDARD, D-118).

scripts/run_platform.sh Step 5b: parallel kyverno-json plan-JSON pass; merges
Checkov/Wiz + kj PCR lists into the confidence signal policy input; skips
gracefully when kj absent (D-120).

tests: test_plan_json_policies.py, test_meta_policies.py (skip-without-kj),
test_run_platform_plan_json_policies.py (script-substring assertion, no skip).

---ci---
project: acdl
phase: 3
milestone: v1.25
status: execute
phase_role: execution
requirements:
  covered: [REQ-300, REQ-301, REQ-302, REQ-303]
  partial: []
---/ci---

scripts/run_platform.sh

@@ -518,8 +518,59 @@ for pcr in pcrs:
     marker = 'PASS' if res == 'pass' else 'FAIL' if res == 'fail' else 'SKIP' if res == 'skipped' else res.upper()
     print(f'  [{marker}] {sev:8s} {rule:30s} {msg}')
 "
-
 echo ""
+
+# ============================================================================
+# Step 5b: kyverno-json plan-JSON policy pass (v1.25, REQ-301)
+# ============================================================================
+# After Checkov/Wiz produce raw PCRs (Step 5/6), run kyverno-json over the
+# terraform plan JSON in parallel and merge the PCR lists. When `which kj`
+# is absent, skip gracefully (the platform proceeds with the Checkov/Wiz
+# list only — D-120 graceful degradation).
+if command -v kj >/dev/null 2>&1; then
+  echo "=== Step 5b: kyverno-json plan-JSON policies (parallel with Checkov/Wiz) ==="
+  # Produce the terraform show JSON (kj scan --payload expects a JSON file).
+  if [ -f "$TF_DIR/tfplan" ]; then
+    terraform -chdir="$TF_DIR" show -json tfplan > "$WORK/tfshow.json" 2>/dev/null || true
+    if [ -s "$WORK/tfshow.json" ]; then
+      python3 - <<'PY' > "$WORK/kj-pcr.json" 2>"$WORK/kj.err" || echo "[]"
+import json, sys
+from pathlib import Path
+sys.path.insert(0, ".")
+import importlib.util
+_spec = importlib.util.spec_from_file_location("kj_engine", "adapters/kyverno-json/kyverno_json_engine.py")
+_mod = importlib.util.module_from_spec(_spec)
+_spec.loader.exec_module(_mod)
+eng = _mod.KyvernoJsonEngine()
+if not eng.is_configured():
+    print("[]"); sys.exit(0)
+out = eng.evaluate(json.load(open("$WORK/tfshow.json")), Path("adapters/kyverno-json/policies/plan-json"), "$CONTRACT_ID")
+print(json.dumps(out))
+PY
+      if [ -s "$WORK/kj-pcr.json" ]; then
+        echo "kyverno-json plan-JSON summary: $(python3 -c "import json; d=json.load(open('$WORK/kj-pcr.json')); print(len([p for p in d if p.get('result')=='fail']), 'failed,', len([p for p in d if p.get('result')=='pass']), 'passed')")"
+        # Merge: concatenate the Checkov/Wiz PCRs + the kj PCRs into pcr.json.
+        python3 -c "
+import json
+ckv = json.load(open('$WORK/pcr.json'))
+kj = json.load(open('$WORK/kj-pcr.json'))
+json.dump(ckv + kj, open('$WORK/pcr.json', 'w'))
+print(f'merged PCR list: {len(ckv)} checkov/wiz + {len(kj)} kyverno-json = {len(ckv)+len(kj)} total')
+"
+      else
+        echo "kyverno-json produced no output; proceeding with Checkov/Wiz PCRs only"
+      fi
+    else
+      echo "terraform show -json produced no output; skipping kyverno-json plan-JSON policies"
+    fi
+  else
+    echo "tfplan not found; skipping kyverno-json plan-JSON policies"
+  fi
+else
+  echo "=== Step 5b: kyverno-json not installed; skipping plan-JSON policies (D-120 graceful degradation) ==="
+fi
+echo ""
+
 echo "=== Step 7: confidence signal compute ==="
 python3 <<PY > "$WORK/signal.json" || fail "confidence signal failed"
 import json