Remove disabled annotation from AskUserTest and update E2ETestContext to locate CLI in test/harness directory

Author: brunoborges

src/test/java/com/github/copilot/sdk/AskUserTest.java

@@ -20,23 +20,14 @@
 import com.github.copilot.sdk.json.UserInputRequest;
 import com.github.copilot.sdk.json.UserInputResponse;
 
-import org.junit.jupiter.api.Disabled;
-
 /**
  * Tests for user input handler (ask_user) functionality.
  *
  * <p>
  * These tests use the shared CapiProxy infrastructure for deterministic API
  * response replay. Snapshots are stored in test/snapshots/ask-user/.
  * </p>
- * <p>
- * <b>Note:</b> These tests are currently disabled because they require CLI
- * version 0.0.400+ which supports the ask_user tool. The test harness uses a
- * separate XDG_CONFIG_HOME which causes the CLI to download an older runtime
- * version (0.0.394) that doesn't support ask_user.
- * </p>
  */
-@Disabled("Requires CLI version 0.0.400+ with ask_user tool support. See class javadoc for details.")
 public class AskUserTest {
 
     private static E2ETestContext ctx;

src/test/java/com/github/copilot/sdk/E2ETestContext.java

@@ -221,14 +221,35 @@ private static String getCliPath(Path repoRoot) throws IOException {
             return envPath;
         }
 
+        // Try test harness platform-specific binary (preferred as it works directly)
+        String os = System.getProperty("os.name").toLowerCase();
+        String arch = System.getProperty("os.arch").toLowerCase();
+        String platform = os.contains("mac") ? "darwin" : os.contains("win") ? "win32" : "linux";
+        String cpuArch = arch.contains("aarch64") || arch.contains("arm64") ? "arm64" : "x64";
+        Path platformBinary = repoRoot
+                .resolve("test/harness/node_modules/@github/copilot-" + platform + "-" + cpuArch + "/copilot");
+        if (os.contains("win")) {
+            platformBinary = repoRoot
+                    .resolve("test/harness/node_modules/@github/copilot-" + platform + "-" + cpuArch + "/copilot.exe");
+        }
+        if (Files.exists(platformBinary)) {
+            return platformBinary.toString();
+        }
+
+        // Try test harness npm-loader.js
+        Path harnessCliPath = repoRoot.resolve("test/harness/node_modules/@github/copilot/npm-loader.js");
+        if (Files.exists(harnessCliPath)) {
+            return harnessCliPath.toString();
+        }
+
         // Try nodejs installation
         Path cliPath = repoRoot.resolve("nodejs/node_modules/@github/copilot/index.js");
         if (Files.exists(cliPath)) {
             return cliPath.toString();
         }
 
         throw new IOException("CLI not found. Either install 'copilot' globally, set COPILOT_CLI_PATH, "
-                + "or run 'npm install' in the nodejs directory.");
+                + "or run 'npm install' in the nodejs directory or test/harness directory.");
     }
 
     private static String findCopilotInPath() {