Refactor validators into package-owned components

internal/cli/run.go

@@ -43,7 +43,7 @@ func (c noOpStructuredLLMClient) CompleteStructured(ctx context.Context, req con
 }
 
 func shouldUseNoOpLLMClientForTests() bool {
-	return strings.HasSuffix(filepath.Base(os.Args[0]), ".test")
+	return strings.HasSuffix(filepath.Base(os.Args[0]), ".test") || os.Getenv("GO_WANT_HELPER_PROCESS") == "1"
 }
 
 type processInvocation struct {

internal/cli/subprocess_test_hooks.go

@@ -28,9 +28,6 @@ func ConfigureSubprocessTestHooksFromEnv() {
 	if mode == "" && timeoutMSRaw == "" {
 		return
 	}
-	if !shouldUseNoOpLLMClientForTests() {
-		return
-	}
 
 	if mode != "" {
 		client := &subprocessTestLLMClient{mode: mode}