feat(cli): orchestrate full uatu test pipeline

runTestPipeline assembles the v0.1 stack end to end:
  1. Bundle the spec (with @uatu/spec alias resolution)
  2. Extract the embedded sidecar JAR
  3. Spawn java -jar sidecar --port <free>
  4. Wait for sidecar Health
  5. Listen on a host TCP port + adb reverse to the device's
     localabstract:uatu-agent socket
  6. Launch the app via the maestro driver
  7. Accept the SDK HELLO
  8. Load the bundle into the verifier
  9. Open the trace writer + write meta.json
  10. runner.Run for the requested duration
  11. Terminate the app + clean up adb reverse

Test subcommand now prints a bundle error for a missing spec,
verifying the flag surface reaches the pipeline.

cmd/uatu/main_test.go

@@ -113,18 +113,16 @@ func TestRun_Doctor(t *testing.T) {
 	}
 }
 
-func TestRun_TestSubcommand(t *testing.T) {
-	var stdout bytes.Buffer
+func TestRun_TestSubcommand_ReportsBundleErrorForMissingSpec(t *testing.T) {
+	// Without a real spec file the pipeline should fail at the bundle step
+	// rather than panicking — proves the flag wiring reaches the runner.
 	err := run([]string{
 		"uatu", "test",
-		"--spec", "s.ts",
+		"--spec", "definitely-missing-spec.ts",
 		"--bundle-id", "com.example",
 		"--avd", "Pixel_5_API_33",
-	}, &stdout, io.Discard)
-	if err != nil {
-		t.Fatal(err)
-	}
-	if !strings.Contains(stdout.String(), "uatu test (stub)") {
-		t.Errorf("test stub output missing, got: %q", stdout.String())
+	}, io.Discard, io.Discard)
+	if err == nil || !strings.Contains(err.Error(), "bundle") {
+		t.Errorf("expected bundle error, got %v", err)
 	}
 }