按规划继续工作

结论：补齐显式参数文件 override 路径的浏览器 OPFS 保存和备份读回验证，继续通过 vendored LinuxCNC save_parameters 路径覆盖。

wasm-port/docs/compatibility-validation.md

@@ -296,7 +296,9 @@ rejection, missing-file success, missing required numeric parameter defaulting,
 required numeric parameter writeback, removal of named-parameter-only lines
 from saved output, and the `.bak` backup produced by vendored
 `save_parameters()`, including browser OPFS readback of the backup text after
-the host bridge writes it to persistent storage. It also covers LinuxCNC tool-table
+the host bridge writes it to persistent storage, plus explicit host
+parameter-file override paths saved back to OPFS with their LinuxCNC-produced
+backup text. It also covers LinuxCNC tool-table
 load/save behavior through vendored `tooldata_common.cc`, including the
 non-random and random-toolchanger `tooldata_init()` branches, with the SDK
 only copying text into the Emscripten filesystem and calling the exported C