fix(lambda): define dirname in handler bundle

packages/aws-lambda/scripts/build-zip.test.ts

@@ -0,0 +1,14 @@
+import { describe, expect, it } from "bun:test";
+import { readFileSync } from "node:fs";
+import { fileURLToPath } from "node:url";
+
+describe("build-zip handler banner", () => {
+  it("defines CommonJS path globals for inlined CJS dependencies", () => {
+    const source = readFileSync(fileURLToPath(new URL("./build-zip.ts", import.meta.url)), "utf8");
+
+    expect(source).toContain('import { fileURLToPath as __hf_fileURLToPath } from "url";');
+    expect(source).toContain('import { dirname as __hf_dirname } from "path";');
+    expect(source).toContain("const __filename = __hf_fileURLToPath(import.meta.url);");
+    expect(source).toContain("const __dirname = __hf_dirname(__filename);");
+  });
+});

packages/aws-lambda/scripts/build-zip.ts

@@ -252,6 +252,10 @@ async function bundleHandler(stagingDir: string): Promise<void> {
         "// hyperframes-aws-lambda handler bundle",
         'import { createRequire as __hf_createRequire } from "module";',
         "const require = __hf_createRequire(import.meta.url);",
+        'import { fileURLToPath as __hf_fileURLToPath } from "url";',
+        'import { dirname as __hf_dirname } from "path";',
+        "const __filename = __hf_fileURLToPath(import.meta.url);",
+        "const __dirname = __hf_dirname(__filename);",
       ].join("\n"),
     },
   });