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/opfs/path-model.js

@@ -61,6 +61,37 @@ export function toolTablePath(machineId, filename = "tool.tbl") {
   );
 }
 
+export function toolDbRootPath(machineId) {
+  return opfsPath(
+    ROOT,
+    "machines",
+    assertSegment(machineId, "machine id"),
+    "tool-db",
+  );
+}
+
+export function toolDbFilePath(machineId, filename = "db_nonran_file") {
+  return opfsPath(
+    ROOT,
+    "machines",
+    assertSegment(machineId, "machine id"),
+    "tool-db",
+    assertSegment(filename, "tool DB filename"),
+  );
+}
+
+export function toolDbTranscriptPath(machineId, runId, filename = "transcript.json") {
+  return opfsPath(
+    ROOT,
+    "machines",
+    assertSegment(machineId, "machine id"),
+    "tool-db",
+    "transcripts",
+    assertSegment(runId, "tool DB run id"),
+    assertSegment(filename, "tool DB transcript filename"),
+  );
+}
+
 export function parameterFilePath(machineId, filename = "linuxcnc.var") {
   return opfsPath(
     ROOT,