建立ToolDbProcessPort合约层

结论：已新增ToolDbProcessPort合约、OPFS tool DB flat-file/transcript store和Node/WASM gates，baseline保持28/28/131/0且promotion继续锁定。

wasm-port/runtime/sdk/src/index.js

@@ -91,6 +91,14 @@ export {
   planIniFileContextStaging,
   planSimConfigStaging,
 } from "./sim-config-staging.js";
+export {
+  TOOL_DB_PROCESS_PORT_CONTRACT_VERSION,
+  TOOL_DB_TRANSACTION_PLAN,
+  createLinuxCncToolDbProcessPort,
+  createToolDbProcessDiagnostics,
+  createToolDbTransactionPlan,
+  validateToolDbTranscript,
+} from "./tool-db-process-port.js";
 
 export {
   defaultMachinePaths,
@@ -103,6 +111,9 @@ export {
   previewCachePath,
   sessionSnapshotPath,
   splitOpfsPath,
+  toolDbFilePath,
+  toolDbRootPath,
+  toolDbTranscriptPath,
   toolTablePath,
 } from "../../opfs/path-model.js";
 export {
@@ -138,6 +149,13 @@ export {
   loadMachineToolTableFromOpfs,
   saveMachineToolTableToOpfs,
 } from "../../opfs/linuxcnc-tool-table-bridge.js";
+export {
+  createToolDbStorePaths,
+  loadToolDbFile,
+  loadToolDbTranscript,
+  saveToolDbFile,
+  saveToolDbTranscript,
+} from "../../opfs/tool-db-store.js";
 export { loadMachineSessionFromOpfs } from "../../opfs/linuxcnc-machine-session-bridge.js";
 export { readMachineSessionReadiness } from "../../opfs/machine-session-readiness.js";