按规划继续工作

结论：OPFS 参数文件已通过桥接进入 LinuxCNC-backed WASM restore/save 路径，native 与 host/WASM/browser 验证全部通过。

wasm-port/runtime/opfs/linuxcnc-parameter-bridge.js

@@ -0,0 +1,63 @@
+import { loadTextFile, saveTextFile } from "./file-service.js";
+import { parameterFilePath } from "./path-model.js";
+
+const DEFAULT_WASM_PARAMETER_PATH = "/work/linuxcnc.var";
+
+function requireParameterSdk(interp) {
+  for (const method of ["writeTextFile", "readTextFile", "restoreParameters", "saveParameters"]) {
+    if (typeof interp?.[method] !== "function") {
+      throw new Error(`interpreter SDK is missing ${method}().`);
+    }
+  }
+}
+
+function resolvePaths(machineId, options = {}) {
+  const opfsPath = options.opfsPath ?? parameterFilePath(machineId, options.filename);
+  const wasmPath = options.wasmPath ?? DEFAULT_WASM_PARAMETER_PATH;
+  return { opfsPath, wasmPath };
+}
+
+function readOptionalWasmTextFile(interp, path) {
+  try {
+    return interp.readTextFile(path);
+  } catch {
+    return null;
+  }
+}
+
+export async function restoreMachineParametersFromOpfs(interp, machineId, options = {}) {
+  requireParameterSdk(interp);
+  const { opfsPath, wasmPath } = resolvePaths(machineId, options);
+  const text = await loadTextFile(opfsPath, options.storage);
+  interp.writeTextFile(wasmPath, text);
+  return {
+    opfsPath,
+    wasmPath,
+    result: interp.restoreParameters(wasmPath),
+  };
+}
+
+export async function saveMachineParametersToOpfs(interp, machineId, values, options = {}) {
+  requireParameterSdk(interp);
+  const { opfsPath, wasmPath } = resolvePaths(machineId, options);
+  const existingText = await loadTextFile(opfsPath, options.storage);
+  interp.writeTextFile(wasmPath, existingText);
+
+  const result = interp.saveParameters(wasmPath, values);
+  const savedText = interp.readTextFile(wasmPath);
+  const backupText = readOptionalWasmTextFile(interp, `${wasmPath}.bak`);
+
+  await saveTextFile(opfsPath, savedText, options.storage);
+  if (backupText !== null) {
+    await saveTextFile(`${opfsPath}.bak`, backupText, options.storage);
+  }
+
+  return {
+    opfsPath,
+    backupOpfsPath: backupText === null ? null : `${opfsPath}.bak`,
+    wasmPath,
+    result,
+    savedText,
+    backupText,
+  };
+}