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/runtime/sdk/README.md

@@ -486,6 +486,10 @@ private module paths:
   `saveSessionSnapshot()`, `saveMachineSessionSnapshot()`,
   `loadMachineSessionSnapshot()`, and `validateSessionSnapshot()` for session
   snapshot persistence.
+- `createVirtualHalSessionPayload()` and
+  `restoreVirtualHalStateFromSessionSnapshot()` for saving and restoring Web
+  virtual HAL state with source compliance, sim-config coverage, halcmd
+  fixtures, and motion controller matrix evidence.
 - `machineFilePaths()`, `saveMachineTextFiles()`, `loadMachineTextFiles()`, and
   `gcodeFilenameFromProgramPath()` for machine-file and G-code file helpers.
 - `readMachineSessionReadiness()` for checking persisted INI, parameter,