尽快推进：同步WASM smoke OPFS边界

check-linuxcnc-wasm-smoke-source-map.sh

@@ -133,6 +133,13 @@ if grep -R -n -E 'localStorage|sessionStorage|indexedDB|showOpenFilePicker|showS
     echo "browser app/wasm code must not add filesystem persistence outside OPFS" >&2
     exit 1
 fi
+if grep -n -E 'localStorage|sessionStorage|indexedDB|showOpenFilePicker|showSaveFilePicker|showDirectoryPicker|webkitRequestFileSystem|FileReader' \
+    web/test-browser-wasm-smoke-*.js \
+    web/test-browser-wasm-smoke.html \
+    test-web-wasm-browser-smoke.sh; then
+    echo "browser WASM smoke harness must not add filesystem persistence outside OPFS" >&2
+    exit 1
+fi
 
 python3 - <<'PY'
 from pathlib import Path
@@ -174,6 +181,7 @@ required_phrases = [
     "must not expand the temporary smoke parser",
     "persistence OPFS-only",
     "Node smoke must leave OPFS disabled",
+    "Browser smoke harness files must not use Local Storage",
     "Generated switchkins config smoke cases",
     "browser smoke shell guard also pins required section names",
     "OPFS workspace/policy/directory handling",