参考所有分组，完成尽量多的内容。禁止顺手扩功能 smoke

结论：按 align-linuxcnc 约束收窄 OPFS removeFile 和 LinuxCNC 参数 .new/.bak 清理为文件专用语义，避免把同名目录递归删除。依据 ../linuxcnc/src/emc/rs274ngc/rs274ngc_pre.cc save_parameters() 的 fopen(filename.new)、unlink(filename.bak)、link、rename 行为。

验证：./test-native.sh 通过；./test-linuxcnc-source-link.sh 通过。

test-native.sh

@@ -366,7 +366,10 @@ if grep -R -n -E 'localStorage|sessionStorage|indexedDB|showOpenFilePicker|showS
 fi
 grep -F 'LinuxCNC source basis: rs274ngc_pre.cc restore_parameters() reads the' web/src/wasm-core.js >/dev/null
 grep -F 'before replacing the main file and managing filename + ".bak".' web/src/wasm-core.js >/dev/null
-grep -F 'await removeOpfsEntry(workspacePath, `${path}.new`, false);' web/src/wasm-core.js >/dev/null
+grep -F 'async function removeOpfsFileEntry(workspacePath, relativePath)' web/src/wasm-core.js >/dev/null
+grep -F 'await removeOpfsFileEntry(workspacePath, `${path}.new`);' web/src/wasm-core.js >/dev/null
+grep -F 'removeWasmFilePath(module, `${LINUXCNC_DEFAULT_PARAMETER_FILE}.new`);' web/src/wasm-core.js >/dev/null
+grep -F 'OPFS removeFile removed a directory instead of preserving file-only semantics' web/test-browser-wasm-smoke-opfs-directory-sections.js >/dev/null
 grep -F 'OPFS workspace is required for browser program parsing' web/src/app.js >/dev/null
 grep -F 'const events = await simulator.parseFileWithParameterFile(programPath, parameterPath, "linuxcnc", parseOptions);' web/src/app.js >/dev/null
 grep -F 'default browser simulator did not create an OPFS workspace' web/test-browser-wasm-smoke-opfs-policy-sections.js >/dev/null