Reject placeholder OpenBao drill evidence

scripts/openbao-validate-emergency-drill-evidence.sh

@@ -95,6 +95,16 @@ for marker in secret_markers:
     if marker in encoded:
         errors.append(f"secret-looking marker present: {marker}")
 
+placeholder_markers = [
+    "YYYY-MM-DD",
+    "example",
+    "Do not record",
+    "<",
+]
+for marker in placeholder_markers:
+    if marker in encoded:
+        errors.append(f"template placeholder present: {marker}")
+
 if errors:
     for error in errors:
         print(f"[FAIL] {error}", file=sys.stderr)