按建议，继续完成后续工作

结论：已将 INI 面板的 OPFS 文本文件读写抽为 host-side file-service，并新增 Node mock 验证，确认 OPFS 边界不进入 WASM core 且可覆盖保存、读取、缺失路径和非法路径行为。

wasm-port/tests/opfs/node/verify_file_service.mjs

@@ -0,0 +1,89 @@
+import assert from "node:assert/strict";
+
+import {
+  getOpfsRoot,
+  loadTextFile,
+  saveTextFile,
+} from "../../../runtime/opfs/file-service.js";
+
+class MockFileHandle {
+  constructor(name) {
+    this.name = name;
+    this.textValue = "";
+  }
+
+  async createWritable() {
+    return {
+      write: async (text) => {
+        this.textValue = String(text);
+      },
+      close: async () => {},
+    };
+  }
+
+  async getFile() {
+    return {
+      text: async () => this.textValue,
+    };
+  }
+}
+
+class MockDirectoryHandle {
+  constructor(name = "") {
+    this.name = name;
+    this.dirs = new Map();
+    this.files = new Map();
+  }
+
+  async getDirectoryHandle(name, options = {}) {
+    if (!this.dirs.has(name)) {
+      if (!options.create) {
+        throw new Error(`missing directory: ${name}`);
+      }
+      this.dirs.set(name, new MockDirectoryHandle(name));
+    }
+    return this.dirs.get(name);
+  }
+
+  async getFileHandle(name, options = {}) {
+    if (!this.files.has(name)) {
+      if (!options.create) {
+        throw new Error(`missing file: ${name}`);
+      }
+      this.files.set(name, new MockFileHandle(name));
+    }
+    return this.files.get(name);
+  }
+}
+
+const root = new MockDirectoryHandle();
+const storage = {
+  getDirectory: async () => root,
+};
+
+assert.equal(await getOpfsRoot(storage), root);
+
+await saveTextFile(
+  "linuxcnc/machines/xyzab.ini",
+  "[EMC]\nMACHINE = opfs-smoke\n",
+  storage,
+);
+assert.equal(
+  await loadTextFile("linuxcnc/machines/xyzab.ini", storage),
+  "[EMC]\nMACHINE = opfs-smoke\n",
+);
+
+await assert.rejects(
+  () => loadTextFile("linuxcnc/machines/missing.ini", storage),
+  /missing file/,
+);
+await assert.rejects(
+  () => saveTextFile("../escape.ini", "", storage),
+  /Invalid OPFS path/,
+);
+await assert.rejects(
+  () => getOpfsRoot({}),
+  /OPFS is not available/,
+);
+
+console.log("opfs_file_service_node_smoke=ok");

wasm-port/tests/opfs/node/verify_file_service.sh

@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "$0")/../../.." && pwd)"
+
+node "$ROOT_DIR/tests/opfs/node/verify_file_service.mjs"