推进 OPFS 机器会话快照保存入口

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

@@ -19,6 +19,7 @@ import {
   createMachineSessionSnapshotPayload,
   createSessionSnapshot,
   loadSessionSnapshot,
+  saveMachineSessionSnapshot,
   saveSessionSnapshot,
   validateSessionSnapshot,
 } from "../../../runtime/opfs/snapshot-store.js";
@@ -325,6 +326,30 @@ assert.deepEqual(
   }),
   customSnapshot,
 );
+const machineSessionSnapshot = await saveMachineSessionSnapshot(
+  "machine-session-1",
+  "xyzab-tdr",
+  {
+    storage,
+    filename: "machine-session-snapshot.json",
+    gcodeFilename: "fixture.ngc",
+    createdAt: "2026-06-08T00:00:00.000Z",
+    metadata: { source: "node-machine-session" },
+  },
+);
+assertSessionSnapshotStoragePath(
+  "machine-session-1",
+  sessionSnapshotPath("machine-session-1", "machine-session-snapshot.json"),
+  "machine-session-snapshot.json",
+);
+assert.deepEqual(machineSessionSnapshot.payload, snapshotPayload);
+assert.deepEqual(
+  await loadSessionSnapshot("machine-session-1", {
+    storage,
+    filename: "machine-session-snapshot.json",
+  }),
+  machineSessionSnapshot,
+);
 
 await saveMachineTextFiles("xyzab-tdr", {
   ini: "[EMC]\nMACHINE = xyzab-tdr\n",