Update to use stable Go and add comprehensive CI/CD

- Replace gotip with stable Go in GitHub Actions
- Add automatic GVR inference for Kubernetes types
- Rename API: NewClient (inferred GVR) and NewClientGVR (explicit)
- Add comprehensive test coverage including e2e tests
- Update CI to include linting, unit tests, and e2e tests with kind
- Add .gitignore for common Go development files
- Update README with usage examples and features

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

main.go

@@ -7,24 +7,10 @@ import (
 	"github.com/imjasonh/client-go2/generic"
 	corev1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
-	"k8s.io/apimachinery/pkg/runtime/schema"
 	"k8s.io/client-go/tools/cache"
 	"k8s.io/client-go/tools/clientcmd"
 )
 
-var (
-	podGVR = schema.GroupVersionResource{
-		Group:    "",
-		Version:  "v1",
-		Resource: "pods",
-	}
-	cmGVR = schema.GroupVersionResource{
-		Group:    "",
-		Version:  "v1",
-		Resource: "configmaps",
-	}
-)
-
 func main() {
 	ctx := context.Background()
 	config, err := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(clientcmd.NewDefaultClientConfigLoadingRules(), &clientcmd.ConfigOverrides{}).ClientConfig()
@@ -32,8 +18,12 @@ func main() {
 		log.Fatalf("ClientConfig: %v", err)
 	}
 
-	// List pods in kube-system.
-	pods, err := generic.NewClient[*corev1.Pod](podGVR, config).List(ctx, "kube-system")
+	// List pods in kube-system using automatic GVR inference.
+	podClient, err := generic.NewClient[*corev1.Pod](config)
+	if err != nil {
+		log.Fatal("creating pod client:", err)
+	}
+	pods, err := podClient.List(ctx, "kube-system")
 	if err != nil {
 		log.Fatal("listing pods:", err)
 	}
@@ -42,7 +32,11 @@ func main() {
 		log.Println("-", p.Name)
 	}
 
-	cmc := generic.NewClient[*corev1.ConfigMap](cmGVR, config)
+	// For ConfigMaps, we'll also use automatic GVR inference
+	cmc, err := generic.NewClient[*corev1.ConfigMap](config)
+	if err != nil {
+		log.Fatal("creating configmap client:", err)
+	}
 	cmc.Start(ctx)
 
 	// Start an informer to log all adds/updates/deletes for ConfigMaps.