diff --git a/text10.txt b/text10.txt
index 4b03c0d..0ec5d6a 100644
--- a/text10.txt
+++ b/text10.txt
@@ -415,3 +415,66 @@ host_wasm_opfs_browser_smokes=ok
 后校验 `payload.machineId` 与机器文件 path 结构，并补 Node/browser smoke；如果该入口
 已足够清晰，再把 save/load machine session snapshot 接到 INI panel 的实际会话保存/恢复
 workflow。仍只处理 OPFS/filesystem/browser boundary，不引入或重写任何 CNC 语义。
+
+四、2026-06-14 继续执行记录：OPFS machine session snapshot load helper
+
+本轮继续按“加快实质性推进铁律”推进 OPFS/session persistence 的实际 API 入口，
+补齐 machine session snapshot 的读取校验侧能力。
+
+完成内容：
+
+- 在 `wasm-port/runtime/opfs/snapshot-store.js` 新增
+  `loadMachineSessionSnapshot(sessionId, machineId, options)`；
+- 该 helper 复用既有 `loadSessionSnapshot(...)` envelope 校验，然后校验
+  `payload.machineId` 与调用方传入的 `machineId` 一致；
+- 新增内部 machine snapshot payload 校验，要求 `payload.files` 为 plain object，
+  且 `ini`、`parameters`、`toolTable` 为合法 OPFS path，`gcode` 如存在也必须是合法
+  OPFS path；
+- 校验只覆盖 host-side snapshot/path boundary，不解释 G-code、parameter、tool-table
+  内容，不扩大 CNC 语义边界；
+- 在 Node OPFS smoke 中覆盖 machine snapshot load round trip、machine id mismatch
+  reject，以及非法 OPFS path reject；
+- 在 browser INI panel smoke 中覆盖浏览器运行时的 checked machine snapshot load 和
+  wrong-machine reject；
+- 未改变 generic session snapshot envelope、path model、file-service、save/load API
+  兼容性或已有 storage 行为；
+- 未改变 OPFS bridge behavior、SDK planner、interpreter、INI、tool、parameter 或
+  LinuxCNC-owned runtime semantics。
+
+验证已通过：
+
+```bash
+git diff --check
+wasm-port/tests/opfs/node/verify_file_service.sh
+SKIP_INI_BUILD=1 SKIP_INTERP_BUILD=1 wasm-port/tests/browser/verify_ini_panel_browser.sh
+wasm-port/tools/verify_vendor_sync.sh
+wasm-port/tools/verify_no_standalone_cnc_semantics.sh
+SKIP_INTERP_BUILD=1 wasm-port/tests/wasm/node/verify_interp_wasm.sh
+SKIP_INTERP_BUILD=1 wasm-port/tests/wasm/node/verify_sim_configs_inventory_wasm.sh
+SKIP_INI_BUILD=1 SKIP_INTERP_BUILD=1 wasm-port/tests/browser/verify_interp_browser.sh
+wasm-port/tests/host/verify_host_smokes.sh
+```
+
+关键输出：
+
+```text
+opfs_file_service_node_smoke=ok
+browser_ini_opfs_smoke=ok
+vendor sync up to date
+standalone CNC semantics guard complete
+interp_wasm_node_smoke=ok
+sim_configs_wasm_node_inventory_executed=28
+sim_configs_wasm_node_inventory_passed=28
+sim_configs_wasm_node_inventory_skipped=131
+sim_configs_wasm_node_inventory_unexpected_fail=0
+browser_interp_smoke=ok
+host_wasm_opfs_browser_smokes=ok
+```
+
+下一步建议：
+
+继续把 machine session snapshot save/load helper 接到更明确的用户流程。优先扫描
+`wasm-port/runtime/ui/ini-panel/app.js` 和 browser smoke，增加一个最小会话保存/恢复
+workflow：保存当前 INI、parameter/tool-table path 和可选 G-code snapshot，再通过
+`loadMachineSessionSnapshot(...)` 恢复出待加载文件清单。范围仍限定 OPFS/filesystem/UI
+workflow，不解析或重写任何 LinuxCNC-owned CNC 语义。
diff --git a/wasm-port/runtime/opfs/snapshot-store.js b/wasm-port/runtime/opfs/snapshot-store.js
index 0b5b120..6e0309e 100644
--- a/wasm-port/runtime/opfs/snapshot-store.js
+++ b/wasm-port/runtime/opfs/snapshot-store.js
@@ -27,6 +27,27 @@ function optionalOpfsPath(value, label) {
   return normalizeOpfsPath(value);
 }
 
+function requiredSnapshotFilePath(files, key, label) {
+  const value = files[key];
+  if (typeof value !== "string") {
+    throw new Error(`${label} must be a string.`);
+  }
+  return normalizeOpfsPath(value);
+}
+
+function validateMachineSessionSnapshotPayload(payload, machineId) {
+  assertPlainObject(payload, "machine session snapshot payload");
+  if (payload.machineId !== machineId) {
+    throw new Error(`Machine session snapshot id mismatch: ${payload.machineId}`);
+  }
+  assertPlainObject(payload.files, "machine session snapshot files");
+  requiredSnapshotFilePath(payload.files, "ini", "machine session INI OPFS path");
+  requiredSnapshotFilePath(payload.files, "parameters", "machine session parameter OPFS path");
+  requiredSnapshotFilePath(payload.files, "toolTable", "machine session tool table OPFS path");
+  optionalOpfsPath(payload.files.gcode, "machine session G-code OPFS path");
+  return payload;
+}
+
 export function createMachineSessionSnapshotPayload(machineId, options = {}) {
   assertPlainObject(options, "machine session snapshot options");
   const ini = optionalOpfsPath(options.iniOpfsPath, "INI OPFS path") ??
@@ -95,6 +116,12 @@ export async function saveMachineSessionSnapshot(sessionId, machineId, options =
   return saveSessionSnapshot(sessionId, payload, options);
 }
 
+export async function loadMachineSessionSnapshot(sessionId, machineId, options = {}) {
+  const snapshot = await loadSessionSnapshot(sessionId, options);
+  validateMachineSessionSnapshotPayload(snapshot.payload, machineId);
+  return snapshot;
+}
+
 export async function loadSessionSnapshot(sessionId, options = {}) {
   const path = sessionSnapshotPath(sessionId, options.filename);
   const text = await loadTextFile(path, options.storage);
diff --git a/wasm-port/tests/browser/ini_panel_smoke.html b/wasm-port/tests/browser/ini_panel_smoke.html
index b9c4adc..a2bc884 100644
--- a/wasm-port/tests/browser/ini_panel_smoke.html
+++ b/wasm-port/tests/browser/ini_panel_smoke.html
@@ -16,6 +16,7 @@
     } from "../../runtime/opfs/path-model.js";
     import {
       createMachineSessionSnapshotPayload,
+      loadMachineSessionSnapshot,
       loadSessionSnapshot,
       saveMachineSessionSnapshot,
       saveSessionSnapshot,
@@ -221,6 +222,11 @@ TOOL_TABLE = browser-tool.tbl
         "browser-machine-session",
         { filename: "browser-machine-snapshot.json" },
       );
+      const loadedCheckedMachineSessionSnapshot = await loadMachineSessionSnapshot(
+        "browser-machine-session",
+        "browser-smoke",
+        { filename: "browser-machine-snapshot.json" },
+      );
       assertEqual(
         machineSessionSnapshot.payload.files.parameters,
         "linuxcnc/machines/browser-smoke/browser-linuxcnc.var",
@@ -241,6 +247,20 @@ TOOL_TABLE = browser-tool.tbl
         "browser-machine-session",
         "machine session snapshot metadata",
       );
+      assertEqual(
+        loadedCheckedMachineSessionSnapshot.payload.machineId,
+        "browser-smoke",
+        "checked machine session snapshot id",
+      );
+      await assertRejects(
+        "browser machine snapshot wrong machine",
+        () => loadMachineSessionSnapshot(
+          "browser-machine-session",
+          "other-browser-machine",
+          { filename: "browser-machine-snapshot.json" },
+        ),
+        /Machine session snapshot id mismatch/,
+      );
       await assertRejects(
         "browser snapshot invalid filename save",
         () => saveSessionSnapshot("browser-session", {}, {
diff --git a/wasm-port/tests/opfs/node/verify_file_service.mjs b/wasm-port/tests/opfs/node/verify_file_service.mjs
index fc83558..0d3fcd1 100644
--- a/wasm-port/tests/opfs/node/verify_file_service.mjs
+++ b/wasm-port/tests/opfs/node/verify_file_service.mjs
@@ -18,6 +18,7 @@ import {
 import {
   createMachineSessionSnapshotPayload,
   createSessionSnapshot,
+  loadMachineSessionSnapshot,
   loadSessionSnapshot,
   saveMachineSessionSnapshot,
   saveSessionSnapshot,
@@ -350,6 +351,40 @@ assert.deepEqual(
   }),
   machineSessionSnapshot,
 );
+assert.deepEqual(
+  await loadMachineSessionSnapshot("machine-session-1", "xyzab-tdr", {
+    storage,
+    filename: "machine-session-snapshot.json",
+  }),
+  machineSessionSnapshot,
+);
+await assert.rejects(
+  () => loadMachineSessionSnapshot("machine-session-1", "other-machine", {
+    storage,
+    filename: "machine-session-snapshot.json",
+  }),
+  /Machine session snapshot id mismatch/,
+);
+await saveTextFile(
+  sessionSnapshotPath("machine-session-bad-files"),
+  JSON.stringify({
+    ...machineSessionSnapshot,
+    sessionId: "machine-session-bad-files",
+    payload: {
+      machineId: "xyzab-tdr",
+      files: {
+        ini: "linuxcnc/machines/xyzab-tdr/machine.ini",
+        parameters: "../linuxcnc.var",
+        toolTable: "linuxcnc/machines/xyzab-tdr/tool.tbl",
+      },
+    },
+  }),
+  storage,
+);
+await assert.rejects(
+  () => loadMachineSessionSnapshot("machine-session-bad-files", "xyzab-tdr", { storage }),
+  /Invalid OPFS path/,
+);
 
 await saveMachineTextFiles("xyzab-tdr", {
   ini: "[EMC]\nMACHINE = xyzab-tdr\n",