diff --git a/config/category_test.go b/config/category_test.go
index c4cb708..224e958 100644
--- a/config/category_test.go
+++ b/config/category_test.go
@@ -18,7 +18,6 @@ func TestDefaultCategories_AllPresent(t *testing.T) {
 }
 
 func TestCategoryRegistry_Resolve(t *testing.T) {
-	t.Parallel()
 	ResetCategoryRegistry()
 	defer ResetCategoryRegistry()
 
@@ -34,7 +33,6 @@ func TestCategoryRegistry_Resolve(t *testing.T) {
 }
 
 func TestCategoryRegistry_ResolveFallback(t *testing.T) {
-	t.Parallel()
 	ResetCategoryRegistry()
 	defer ResetCategoryRegistry()
 
@@ -49,7 +47,6 @@ func TestCategoryRegistry_ResolveFallback(t *testing.T) {
 }
 
 func TestCategoryRegistry_Override(t *testing.T) {
-	t.Parallel()
 	ResetCategoryRegistry()
 	defer ResetCategoryRegistry()
 
@@ -66,7 +63,6 @@ func TestCategoryRegistry_Override(t *testing.T) {
 }
 
 func TestCategoryRegistry_ResolveWithDefaults(t *testing.T) {
-	t.Parallel()
 	ResetCategoryRegistry()
 	defer ResetCategoryRegistry()
 
@@ -89,7 +85,6 @@ func TestCategoryRegistry_ResolveWithDefaults(t *testing.T) {
 }
 
 func TestCategoryRegistry_AllCategories(t *testing.T) {
-	t.Parallel()
 	ResetCategoryRegistry()
 	defer ResetCategoryRegistry()
 
@@ -101,7 +96,6 @@ func TestCategoryRegistry_AllCategories(t *testing.T) {
 }
 
 func TestResolveCategory_Convenience(t *testing.T) {
-	t.Parallel()
 	ResetCategoryRegistry()
 	defer ResetCategoryRegistry()
 
diff --git a/config/config_test.go b/config/config_test.go
index a828fa7..306c4ef 100644
--- a/config/config_test.go
+++ b/config/config_test.go
@@ -10,7 +10,6 @@ import (
 )
 
 func TestResolveProviderRequest(t *testing.T) {
-	t.Parallel()
 	// Clear provider env vars to test default resolution
 	os.Unsetenv("OPENAI_BASE_URL")
 	os.Unsetenv("OPENAI_API_BASE")
@@ -56,7 +55,6 @@ func TestIsLocalProviderURL(t *testing.T) {
 }
 
 func TestIsOpenAICompatibleRuntimeEnabled(t *testing.T) {
-	t.Parallel()
 	store := &credentials.MapStore{}
 	credentials.SetDefaultStore(store)
 	t.Cleanup(func() { credentials.SetDefaultStore(nil) })
diff --git a/config/runtime_test.go b/config/runtime_test.go
index db529dd..729b626 100644
--- a/config/runtime_test.go
+++ b/config/runtime_test.go
@@ -119,7 +119,6 @@ func TestProviderModelEnvKeys_AllProvidersPresent(t *testing.T) {
 }
 
 func TestResolveOpenAICompatibleRuntime_WithEnv(t *testing.T) {
-	t.Parallel()
 	store := &credentials.MapStore{}
 	credentials.SetDefaultStore(store)
 	t.Cleanup(func() { credentials.SetDefaultStore(nil) })
@@ -141,7 +140,6 @@ func TestResolveOpenAICompatibleRuntime_WithEnv(t *testing.T) {
 }
 
 func TestResolveOpenAICompatibleRuntime_GrokProvider(t *testing.T) {
-	t.Parallel()
 	store := &credentials.MapStore{}
 	credentials.SetDefaultStore(store)
 	t.Cleanup(func() { credentials.SetDefaultStore(nil) })
@@ -160,7 +158,6 @@ func TestResolveOpenAICompatibleRuntime_GrokProvider(t *testing.T) {
 }
 
 func TestResolveOpenAICompatibleRuntime_FallbackModel(t *testing.T) {
-	t.Parallel()
 	clearKeys := []string{
 		"OPENROUTER_API_KEY", "XAI_API_KEY", "GEMINI_API_KEY",
 		"ANTHROPIC_API_KEY", "CANOPYWAVE_API_KEY", "DEEPSEEK_API_KEY", "ZAI_API_KEY", "OPENAI_API_KEY",
@@ -180,7 +177,6 @@ func TestResolveOpenAICompatibleRuntime_FallbackModel(t *testing.T) {
 }
 
 func TestResolveOpenAICompatibleRuntime_NoKeys(t *testing.T) {
-	t.Parallel()
 	store := &credentials.MapStore{}
 	credentials.SetDefaultStore(store)
 	t.Cleanup(func() { credentials.SetDefaultStore(nil) })