按建议，继续完成后续工作

结论：已新增 OPFS machine file store，支持 INI、tool table、parameter file 和 G-code 的纯文本保存/读取，并在 Node mock 与 Chromium smoke 中验证往返，不引入 CNC 文件格式语义。

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

@@ -21,6 +21,13 @@ import {
   saveSessionSnapshot,
   validateSessionSnapshot,
 } from "../../../runtime/opfs/snapshot-store.js";
+import {
+  loadGcodeProgram,
+  loadMachineTextFiles,
+  machineFilePaths,
+  saveGcodeProgram,
+  saveMachineTextFiles,
+} from "../../../runtime/opfs/machine-file-store.js";
 
 class MockFileHandle {
   constructor(name) {
@@ -91,6 +98,7 @@ assert.deepEqual(defaultMachinePaths("xyzab-tdr"), {
   toolTable: "linuxcnc/machines/xyzab-tdr/tool.tbl",
   parameters: "linuxcnc/machines/xyzab-tdr/linuxcnc.var",
 });
+assert.deepEqual(machineFilePaths("xyzab-tdr"), defaultMachinePaths("xyzab-tdr"));
 
 const snapshotPayload = {
   files: {
@@ -129,6 +137,22 @@ await saveSessionSnapshot("session-1", snapshotPayload, {
 });
 assert.deepEqual(await loadSessionSnapshot("session-1", { storage }), snapshot);
 
+await saveMachineTextFiles("xyzab-tdr", {
+  ini: "[EMC]\nMACHINE = xyzab-tdr\n",
+  toolTable: "T0 P0 ; no tool\nT2 P2 Z1.25 D0.25\n",
+  parameters: "5161 0.0\n5162 0.0\n",
+}, { storage });
+assert.deepEqual(await loadMachineTextFiles("xyzab-tdr", { storage }), {
+  ini: "[EMC]\nMACHINE = xyzab-tdr\n",
+  toolTable: "T0 P0 ; no tool\nT2 P2 Z1.25 D0.25\n",
+  parameters: "5161 0.0\n5162 0.0\n",
+});
+assert.equal(
+  await saveGcodeProgram("fixture.ngc", "G0 X0 Y0\nM2\n", { storage }),
+  "linuxcnc/gcode/fixture.ngc",
+);
+assert.equal(await loadGcodeProgram("fixture.ngc", { storage }), "G0 X0 Y0\nM2\n");
+
 await assert.rejects(
   () => loadTextFile("linuxcnc/machines/missing.ini", storage),
   /missing file/,
@@ -141,6 +165,10 @@ assert.throws(
   () => machineIniPath("../escape"),
   /Invalid machine id/,
 );
+await assert.rejects(
+  () => saveMachineTextFiles("xyzab-tdr", null, { storage }),
+  /machine files must be a plain object/,
+);
 await saveTextFile(sessionSnapshotPath("bad-json"), "{", storage);
 await assert.rejects(
   () => loadSessionSnapshot("bad-json", { storage }),