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/tests/browser/interp_smoke.html

@@ -61,6 +61,35 @@
       }
     }
 
+    function verifyExpectedFileError(fixtureName, output, expectedText) {
+      if (!output.includes("file_open=0")) {
+        throw new Error(`${fixtureName}: missing file_open=0`);
+      }
+
+      const expectedLines = expectedText.split("\n").filter(Boolean);
+      for (const expectedLine of expectedLines) {
+        if (expectedLine.startsWith("absent=")) {
+          const forbidden = expectedLine.slice("absent=".length);
+          if (output.includes(forbidden)) {
+            throw new Error(`${fixtureName}: unexpected ${forbidden}`);
+          }
+          continue;
+        }
+
+        if (expectedLine.startsWith("error_text=")) {
+          const message = expectedLine.slice("error_text=".length);
+          if (!output.includes(`file_error_text=${message}`)) {
+            throw new Error(`${fixtureName}: missing file error ${message}`);
+          }
+          continue;
+        }
+
+        if (expectedLine.startsWith("canon_event=") && !output.includes(expectedLine)) {
+          throw new Error(`${fixtureName}: missing ${expectedLine}`);
+        }
+      }
+    }
+
     async function verifyRejects(fixtureName, operation, expectedPattern) {
       try {
         await operation();
@@ -113,6 +142,19 @@
         );
       }
 
+      for (const errorFixtureName of INTERP_ERROR_FIXTURES) {
+        const programPath = `/work/${errorFixtureName}-error.ngc`;
+        interp.writeTextFile(
+          programPath,
+          await fetchText(`../fixtures/gcode_errors/${errorFixtureName}.ngc`),
+        );
+        verifyExpectedFileError(
+          `${errorFixtureName}_file`,
+          interp.runFile(programPath),
+          (await fetchText(`../fixtures/canon_errors/${errorFixtureName}.expected`)).trimEnd(),
+        );
+      }
+
       const namedParamIniPath = "/work/namedparams.ini";
       const namedParamProgramText = await fetchText(
         `../fixtures/gcode/${INTERP_INI_FIXTURE}.ngc`,