补充 Node WASM 文件路径错误覆盖

结论：Node WASM 解释器 smoke 现在通过 Interp::open/read/execute 文件路径 ABI 验证现有负向 G-code fixture 的 LinuxCNC 错误输出。

wasm-port/docs/compatibility-validation.md

@@ -93,7 +93,10 @@ Emscripten filesystem through the SDK and runs them through LinuxCNC
 file execution path. The same Node smoke writes LinuxCNC-format parameter
 files into the Emscripten filesystem and validates vendored
 `Interp::restore_parameters()` and `Interp::save_parameters()`, including the
-saved parameter values and `.bak` backup file boundary.
+saved parameter values and `.bak` backup file boundary. It also writes the
+negative G-code fixtures into the Emscripten filesystem and verifies their
+LinuxCNC-produced error text through the `Interp::open()`/`read()`/`execute()`
+file path.
 
 The OPFS host-boundary script validates the JavaScript file-service adapter
 with a Node mock of the browser File System Access handles. It covers nested
@@ -260,6 +263,9 @@ path additionally covers the same canonical-event fixture group, plus
 `position_params` uses a dedicated file-path expectation under
 `tests/fixtures/canon_file/` because LinuxCNC file execution advances the
 post-execute position parameters differently than the line-by-line MDI smoke.
+The same Node WASM file-path smoke also covers the negative fixture group and
+checks the LinuxCNC file-execution error text plus absent canonical motion
+constraints where applicable.
 The Node WASM interpreter smoke also covers LinuxCNC parameter-file
 restore/save behavior through the exported C ABI, including out-of-order file
 rejection, missing-file success, required numeric parameter writeback, removal
@@ -356,6 +362,19 @@ Node WASM file-path coverage currently includes:
 - `position_params` through the dedicated `canon_file/` expectation
 - `namedparam_semantics` through the INI-aware file ABI
 
+Node WASM file-path negative coverage currently includes every fixture under
+`tests/fixtures/gcode_errors/`:
+
+- `g1_zero_feed`
+- `arc_radius_mismatch`
+- `arc_zero_radius`
+- `cutter_comp_plane_change`
+- `g53_incremental`
+- `namedparam_readonly`
+- `numbered_param_readonly`
+- `tool_length_offset_not_found`
+- `tool_not_found`
+
 Browser interpreter `Interp::execute()` coverage currently includes:
 
 - `minimal_linear`