补充浏览器文件路径错误覆盖

结论：浏览器解释器 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

@@ -263,9 +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 same Node WASM and browser file-path smokes also cover the negative fixture
+group and check 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
@@ -375,6 +375,19 @@ Node WASM file-path negative coverage currently includes every fixture under
 - `tool_length_offset_not_found`
 - `tool_not_found`
 
+Browser interpreter file-path negative coverage currently includes the same
+negative fixture list through `Interp::open()`/`read()`/`execute()`:
+
+- `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`