继续按 align-linuxcnc 约束：闭合 switchkins 构建预检

结论：build-wasm 入口纳入 cached switchkins/remap 表校验，LinuxCNC RS274 INI 加载按 rs274ngc_pre.cc 保留真实 ini_load 路径，Node/browser generated switchkins smoke 跳过会触发 REMAP 依赖加载的 INI_FILE_NAME 别名；native/source-link/表检查均通过。

docs/linuxcnc-source-policy.md

@@ -112,7 +112,8 @@ Efficiency rules:
   the cached wrapper script, checker script, generator script, the kinematics
   manifest, referenced LinuxCNC source size and nanosecond mtime stats, tracked
   generated table/case outputs, and the thin API/web bridge files that pass
-  switchkins config aliases.
+  switchkins config aliases. Native, source-link, and build-wasm entry points
+  must run this cached check before consuming those aliases.
 - Reuse wasm probe objects across the wasm source object probe,
   `rs274ngc_pre` blocker/link probes, and the runtime link probe through
   `build-linuxcnc-wasm-probe-objects.sh`. Its mode-specific object caches must