fix(qa): reject duplicate qa e2e outputs

scripts/qa-e2e.ts

@@ -44,11 +44,17 @@ export function parseQaE2eArgs(argv: readonly string[]): QaE2eArgs {
   const args = argv[0] === "--" ? argv.slice(1) : argv;
   let outputPath = "";
   let positionalMode = false;
+  const setOutputPath = (value: string) => {
+    if (outputPath) {
+      throw new Error("qa:e2e output path was provided more than once");
+    }
+    outputPath = value;
+  };
   for (let index = 0; index < args.length; index += 1) {
     const arg = args[index] ?? "";
     if (positionalMode) {
       if (!outputPath && arg.trim()) {
-        outputPath = arg.trim();
+        setOutputPath(arg.trim());
         continue;
       }
       throw new Error(`Unexpected qa:e2e argument: ${arg}`);
@@ -65,7 +71,7 @@ export function parseQaE2eArgs(argv: readonly string[]): QaE2eArgs {
       if (!inlineOutput) {
         throw new Error("--output requires a value");
       }
-      outputPath = inlineOutput;
+      setOutputPath(inlineOutput);
       continue;
     }
     if (arg === "--output") {
@@ -73,7 +79,7 @@ export function parseQaE2eArgs(argv: readonly string[]): QaE2eArgs {
       if (!value || value.startsWith("-")) {
         throw new Error("--output requires a value");
       }
-      outputPath = value;
+      setOutputPath(value);
       index += 1;
       continue;
     }
@@ -83,7 +89,7 @@ export function parseQaE2eArgs(argv: readonly string[]): QaE2eArgs {
     if (outputPath) {
       throw new Error(`Unexpected qa:e2e argument: ${arg}`);
     }
-    outputPath = arg.trim();
+    setOutputPath(arg.trim());
   }
   return outputPath ? { help: false, outputPath } : { help: false };
 }

test/scripts/qa-e2e.test.ts

@@ -95,6 +95,23 @@ describe("qa-e2e script", () => {
     expect(() => parseQaE2eArgs(["--output", "--help"])).toThrow("--output requires a value");
   });
 
+  it("rejects duplicate output destinations before loading QA Lab", async () => {
+    const env: NodeJS.ProcessEnv = {};
+    const loadRuntime = vi.fn(async () => {
+      throw new Error("runtime loaded");
+    });
+
+    expect(() =>
+      parseQaE2eArgs(["--output", ".artifacts/first.md", "--output=.artifacts/second.md"]),
+    ).toThrow("qa:e2e output path was provided more than once");
+    await expect(
+      main([".artifacts/first.md", "--output", ".artifacts/second.md"], { env, loadRuntime }),
+    ).rejects.toThrow("qa:e2e output path was provided more than once");
+
+    expect(loadRuntime).not.toHaveBeenCalled();
+    expect(env.OPENCLAW_BUILD_PRIVATE_QA).toBeUndefined();
+  });
+
   it.each([
     { status: "pass" as const, exitCode: 0 },
     { status: "fail" as const, exitCode: 1 },