按规划继续工作

结论：参数文件 restore/save 已通过解释器 WASM C ABI 直连 vendored LinuxCNC，native 与 host/WASM/browser 验证全部通过。

wasm-port/docs/drift-report.md

@@ -32,6 +32,7 @@ semantic rewrites:
 | Interpreter state tags | LinuxCNC `UPDATE_TAG` callbacks are captured from the state tags packed by vendored interpreter code; standalone code does not derive modal state. |
 | Rotary indexer lock state | LinuxCNC `UNLOCK_ROTARY` and `LOCK_ROTARY` callbacks are captured from the vendored single-axis indexer path; standalone code does not implement rotary-indexing semantics. |
 | File flush | LinuxCNC `FINISH` is captured as a canonical test event on the vendored `%`-delimited file-reading path. |
+| WASM parameter-file backup | LinuxCNC `save_parameters()` calls `link()` to create the `.bak` parameter-file backup; `runtime/core/linuxcnc_wrap/linuxcnc_wasm_posix_stubs.cpp` maps that WASM/MEMFS edge to a file copy so the vendored save path can run unchanged. |
 | Interpreter reset | LinuxCNC `ON_RESET` is captured as a canonical test event on the vendored interpreter reset/file-open path. |
 | Interpreter init | LinuxCNC `INIT_CANON` and the canonical initialization sequence from vendored `Interp::init()` are captured as test events. |
 | Comment logging | LinuxCNC `LOGOPEN`, `LOG`, `LOGAPPEND`, and `LOGCLOSE` callbacks are captured as canonical test events instead of writing host log files. |