接入L4-TOOL-DB节点运行时

结论：ToolDbProcessPort 已可通过 Node/native adapter 真实执行 LinuxCNC DB_PROGRAM 协议，浏览器端仍保持锁定直到 Python/WASM Worker 接入。

wasm-port/runtime/sdk/README.md

@@ -569,6 +569,12 @@ private module paths:
   LinuxCNC-owned tool DB process port contract. Contract-only mode does not run
   `DB_PROGRAM`, does not parse `.tbl` as a fallback, and keeps execution and
   promotion disabled.
+- `createLinuxCncToolDbNodeRuntimeAdapter()` in
+  `runtime/sdk/src/tool-db-node-runtime-adapter.js` for Node/native verification
+  of the real LinuxCNC `DB_PROGRAM` child process. This adapter is intentionally
+  not exported from the browser-facing SDK index because it depends on Node
+  process APIs; browser runtime remains locked until a Python/WASM Worker runs
+  the DB program.
 - `saveToolDbFile()`, `loadToolDbFile()`, `saveToolDbTranscript()`, and
   `loadToolDbTranscript()` for OPFS persistence of the DB flat file and protocol
   transcript artifacts.