按规划继续工作

结论：补齐 LinuxCNC tooldata_common.cc 随机换刀器 load/save 验证边界，WASM/SDK/OPFS 只透传 random-toolchanger 配置；native、WASM、OPFS 和浏览器 smoke 验证已通过。

wasm-port/runtime/sdk/README.md

@@ -40,7 +40,11 @@ vendored LinuxCNC RS274NGC sources and exposes:
 - `runFileWithIni(path, iniPath)`
 - `restoreParameters(path)`
 - `saveParameters(path, values)`
-- `loadToolTable(path)`
+- `loadToolTable(path, options)`
 - `saveToolTable(path)`
 - `writeTextFile(path, text)`
 - `readTextFile(path)`
+
+`loadToolTable()` accepts `{ randomToolChanger: true }` to select the
+LinuxCNC random-toolchanger branch before calling vendored
+`tooldata_load()`. The SDK only forwards that runtime boundary flag.