新增 OPFS session readiness SDK helper

wasm-port/runtime/sdk/README.md

@@ -49,6 +49,7 @@ import {
   parameterFilePath,
   planIniFileContextStaging,
   planSimConfigStaging,
+  readMachineSessionReadiness,
   renderIniPanelShellWorkflowOverviewEmbeddingMountState,
   restoreMachineParametersFromOpfs,
   saveMachineSessionSnapshot,
@@ -171,6 +172,9 @@ private module paths:
   snapshot persistence.
 - `machineFilePaths()`, `saveMachineTextFiles()`, `loadMachineTextFiles()`, and
   `gcodeFilenameFromProgramPath()` for machine-file and G-code file helpers.
+- `readMachineSessionReadiness()` for checking persisted INI, parameter,
+  tool-table, optional G-code, and optional session snapshot files before
+  loading a session.
 - `restoreMachineParametersFromOpfs()`, `loadMachineToolTableFromOpfs()`, and
   `loadMachineSessionFromOpfs()` for loading OPFS machine state into the
   LinuxCNC-backed interpreter SDK.