按建议，继续完成后续工作

结论：已新增 OPFS machine file store，支持 INI、tool table、parameter file 和 G-code 的纯文本保存/读取，并在 Node mock 与 Chromium smoke 中验证往返，不引入 CNC 文件格式语义。

wasm-port/docs/drift-report.md

@@ -42,7 +42,7 @@ semantic rewrites:
 | Kinematics component lifecycle | Kinematics modules are initialized through LinuxCNC module entry points where native runtime probes exist, while HAL component init/ready/exit, HAL pin allocation, and RTAPI module metadata are handled by standalone shims. |
 | Go math C/C++ linkage | `genserkins` runtime probing compiles vendored `gomath.c` through a narrow C++ wrapper so LinuxCNC `genserfuncs.c` can link to the upstream Go math symbols without editing vendored source. |
 | Switchkins iterative forward | `genhexkins` runtime probing follows LinuxCNC switchkins iterative-forward behavior, including the first-call warmup path before asserting roundtrip convergence. |
-| Browser storage | OPFS remains outside the native core; `runtime/opfs/file-service.js` owns browser text-file persistence, `runtime/opfs/path-model.js` owns host-side storage paths for INI, tool table, parameter, G-code, preview-cache, and session-snapshot content, and `runtime/opfs/snapshot-store.js` owns generic JSON session snapshot persistence. |
+| Browser storage | OPFS remains outside the native core; `runtime/opfs/file-service.js` owns browser text-file persistence, `runtime/opfs/path-model.js` owns host-side storage paths for INI, tool table, parameter, G-code, preview-cache, and session-snapshot content, `runtime/opfs/snapshot-store.js` owns generic JSON session snapshot persistence, and `runtime/opfs/machine-file-store.js` owns pure-text machine-file and G-code persistence. |
 
 ## Enforced Non-Drift Rules
 
@@ -61,8 +61,9 @@ semantic rewrites:
 - JS SDK validation is currently limited to the INI WASM wrapper around
   vendored LinuxCNC `inifile.cc`.
 - OPFS validation covers a Node mock of the file-service adapter, the
-  host-side path model, generic session snapshot storage, and a Chromium
-  localhost round trip for INI text-file and session snapshot persistence.
+  host-side path model, generic session snapshot storage, pure-text machine
+  file and G-code storage, and a Chromium localhost round trip for those
+  persistence paths.
 - Host-side smoke validation is aggregated by
   `tests/host/verify_host_smokes.sh` so Node, WASM, OPFS, and browser checks
   run from one command.