接入虚拟HAL会话保存恢复

结论：real simulation page 已提供显式 Save/Restore HAL Session 按钮与 browser API，使用 OPFS session snapshot 保存和恢复 virtual HAL runtime state，并随 payload 校验 source compliance、sim-config coverage、halcmd fixtures 与 motion controller matrix，证明虚拟HAL可恢复地满足Web方式数控系统仿真范围。

wasm-port/tests/sdk/node/verify_sdk_surface.mjs

@@ -747,6 +747,7 @@ assert.equal(virtualHalSessionPayload.state.hal.signals["x-pos"].value, 1.25);
 assert.equal(virtualHalSessionPayload.sourceCompliance.complete, true);
 assert.equal(virtualHalSessionPayload.simConfigSourceCoverage.complete, true);
 assert.equal(virtualHalSessionPayload.commandScriptFixtures.complete, true);
+assert.equal(virtualHalSessionPayload.motionControllerMatrix.complete, true);
 const virtualHalSessionSnapshot = createSessionSnapshot(
   "sdk-virtual-hal-session",
   createMachineSessionSnapshotPayload("sdk-mill", {