fix: resolve golangci-lint errcheck warnings

- Add error checks for unchecked return values (errcheck)
- Remove unused struct fields (unused)
- Fix gofmt formatting issues

health/health.go

@@ -8,7 +8,6 @@ import (
 	"log/slog"
 	"net"
 	"net/http"
-	"sync/atomic"
 	"time"
 )
 
@@ -22,7 +21,6 @@ type Server struct {
 	readyPath  string
 	readyCheck ReadyFunc
 	srv        *http.Server
-	ready      atomic.Bool
 }
 
 // New creates a health server on the given port.

health/health_test.go

@@ -19,7 +19,7 @@ func TestHealthEndpoint(t *testing.T) {
 	if err != nil {
 		t.Fatalf("health request failed: %v", err)
 	}
-	defer resp.Body.Close()
+	defer func() { _ = resp.Body.Close() }()
 
 	if resp.StatusCode != 200 {
 		t.Errorf("expected 200, got %d", resp.StatusCode)
@@ -42,7 +42,7 @@ func TestReadyEndpointDefault(t *testing.T) {
 	if err != nil {
 		t.Fatalf("ready request failed: %v", err)
 	}
-	defer resp.Body.Close()
+	defer func() { _ = resp.Body.Close() }()
 
 	if resp.StatusCode != 200 {
 		t.Errorf("expected 200, got %d", resp.StatusCode)
@@ -60,7 +60,7 @@ func TestReadyEndpointNotReady(t *testing.T) {
 	if err != nil {
 		t.Fatalf("ready request failed: %v", err)
 	}
-	resp.Body.Close()
+	_ = resp.Body.Close()
 	if resp.StatusCode != 503 {
 		t.Errorf("expected 503 when not ready, got %d", resp.StatusCode)
 	}
@@ -70,7 +70,7 @@ func TestReadyEndpointNotReady(t *testing.T) {
 	if err != nil {
 		t.Fatalf("ready request failed: %v", err)
 	}
-	resp2.Body.Close()
+	_ = resp2.Body.Close()
 	if resp2.StatusCode != 200 {
 		t.Errorf("expected 200 when ready, got %d", resp2.StatusCode)
 	}