fix(lint): handle all errcheck violations for golangci-lint

Wrap all unhandled error returns with blank identifier assignments
to satisfy the errcheck linter: defer Close(), rand.Read(), json
Encode/Decode, and w.Write() calls across source, tests, and examples.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Zie619

events.go

@@ -31,7 +31,7 @@ type Event struct {
 // generateID creates a random hex ID
 func generateID() string {
 	b := make([]byte, 16)
-	rand.Read(b)
+	_, _ = rand.Read(b)
 	return hex.EncodeToString(b)
 }
 

examples/basic/main.go

@@ -15,7 +15,7 @@ func main() {
 		trusera.WithAgentID("my-agent-123"),
 		trusera.WithFlushInterval(10*time.Second),
 	)
-	defer client.Close()
+	defer func() { _ = client.Close() }()
 
 	// Track a tool call event
 	toolEvent := trusera.NewEvent(trusera.EventToolCall, "calculator").

examples/block-mode/main.go

@@ -31,7 +31,7 @@ func main() {
 	if err != nil {
 		log.Fatalf("Failed to initialize: %v", err)
 	}
-	defer client.Close()
+	defer func() { _ = client.Close() }()
 
 	fmt.Println("Agent registered and HTTP client wrapped with block mode")
 

examples/http-interceptor/main.go

@@ -17,7 +17,7 @@ func main() {
 		trusera.WithAgentID("web-agent"),
 		trusera.WithFlushInterval(30*time.Second),
 	)
-	defer client.Close()
+	defer func() { _ = client.Close() }()
 
 	// Wrap HTTP client with Trusera interception
 	httpClient := trusera.WrapHTTPClient(&http.Client{}, client, trusera.InterceptorOptions{

interceptor_test.go

@@ -17,7 +17,7 @@ func TestWrapHTTPClient(t *testing.T) {
 	defer truseraServer.Close()
 
 	truseraClient := NewClient("test-key", WithBaseURL(truseraServer.URL))
-	defer truseraClient.Close()
+	defer func() { _ = truseraClient.Close() }()
 
 	httpClient := WrapHTTPClient(&http.Client{}, truseraClient, InterceptorOptions{
 		Enforcement: ModeLog,
@@ -50,7 +50,7 @@ func TestInterceptorRecordsRequests(t *testing.T) {
 	defer truseraServer.Close()
 
 	truseraClient := NewClient("test-key", WithBaseURL(truseraServer.URL))
-	defer truseraClient.Close()
+	defer func() { _ = truseraClient.Close() }()
 
 	httpClient := WrapHTTPClient(&http.Client{}, truseraClient, InterceptorOptions{
 		Enforcement: ModeLog,
@@ -85,7 +85,7 @@ func TestExcludePatterns(t *testing.T) {
 	defer truseraServer.Close()
 
 	truseraClient := NewClient("test-key", WithBaseURL(truseraServer.URL))
-	defer truseraClient.Close()
+	defer func() { _ = truseraClient.Close() }()
 
 	httpClient := WrapHTTPClient(&http.Client{}, truseraClient, InterceptorOptions{
 		Enforcement:     ModeLog,
@@ -122,7 +122,7 @@ func TestBlockModeRejectsRequests(t *testing.T) {
 	defer truseraServer.Close()
 
 	truseraClient := NewClient("test-key", WithBaseURL(truseraServer.URL))
-	defer truseraClient.Close()
+	defer func() { _ = truseraClient.Close() }()
 
 	httpClient := WrapHTTPClient(&http.Client{}, truseraClient, InterceptorOptions{
 		Enforcement:   ModeBlock,
@@ -157,7 +157,7 @@ func TestWarnModeAllowsBlockedRequests(t *testing.T) {
 	defer truseraServer.Close()
 
 	truseraClient := NewClient("test-key", WithBaseURL(truseraServer.URL))
-	defer truseraClient.Close()
+	defer func() { _ = truseraClient.Close() }()
 
 	httpClient := WrapHTTPClient(&http.Client{}, truseraClient, InterceptorOptions{
 		Enforcement:   ModeWarn,
@@ -193,7 +193,7 @@ func TestLogModeAllowsAllRequests(t *testing.T) {
 	defer truseraServer.Close()
 
 	truseraClient := NewClient("test-key", WithBaseURL(truseraServer.URL))
-	defer truseraClient.Close()
+	defer func() { _ = truseraClient.Close() }()
 
 	httpClient := WrapHTTPClient(&http.Client{}, truseraClient, InterceptorOptions{
 		Enforcement:   ModeLog,
@@ -259,7 +259,7 @@ func TestRequestBodyCapture(t *testing.T) {
 	defer truseraServer.Close()
 
 	truseraClient := NewClient("test-key", WithBaseURL(truseraServer.URL))
-	defer truseraClient.Close()
+	defer func() { _ = truseraClient.Close() }()
 
 	httpClient := WrapHTTPClient(&http.Client{}, truseraClient, InterceptorOptions{
 		Enforcement: ModeLog,
@@ -282,7 +282,7 @@ func TestCreateInterceptedClient(t *testing.T) {
 	defer truseraServer.Close()
 
 	truseraClient := NewClient("test-key", WithBaseURL(truseraServer.URL))
-	defer truseraClient.Close()
+	defer func() { _ = truseraClient.Close() }()
 
 	httpClient := CreateInterceptedClient(truseraClient, InterceptorOptions{
 		Enforcement: ModeLog,
@@ -311,7 +311,7 @@ func TestConcurrentRequests(t *testing.T) {
 	defer truseraServer.Close()
 
 	truseraClient := NewClient("test-key", WithBaseURL(truseraServer.URL))
-	defer truseraClient.Close()
+	defer func() { _ = truseraClient.Close() }()
 
 	httpClient := WrapHTTPClient(&http.Client{}, truseraClient, InterceptorOptions{
 		Enforcement: ModeLog,

trusera_test.go

@@ -11,7 +11,7 @@ import (
 
 func TestNewClient(t *testing.T) {
 	client := NewClient("test-api-key")
-	defer client.Close()
+	defer func() { _ = client.Close() }()
 
 	if client.apiKey != "test-api-key" {
 		t.Errorf("expected apiKey 'test-api-key', got %s", client.apiKey)
@@ -37,7 +37,7 @@ func TestClientWithOptions(t *testing.T) {
 		WithAgentID(customAgent),
 		WithBatchSize(customBatch),
 	)
-	defer client.Close()
+	defer func() { _ = client.Close() }()
 
 	if client.baseURL != customURL {
 		t.Errorf("expected baseURL %s, got %s", customURL, client.baseURL)
@@ -54,7 +54,7 @@ func TestClientWithOptions(t *testing.T) {
 
 func TestTrackEvent(t *testing.T) {
 	client := NewClient("test-key")
-	defer client.Close()
+	defer func() { _ = client.Close() }()
 
 	event := NewEvent(EventToolCall, "test-tool")
 
@@ -104,7 +104,7 @@ func TestFlush(t *testing.T) {
 	defer server.Close()
 
 	client := NewClient("test-key", WithBaseURL(server.URL))
-	defer client.Close()
+	defer func() { _ = client.Close() }()
 
 	event1 := NewEvent(EventToolCall, "tool1")
 	event2 := NewEvent(EventAPICall, "api1")
@@ -165,12 +165,12 @@ func TestRegisterAgent(t *testing.T) {
 		}
 
 		w.Header().Set("Content-Type", "application/json")
-		json.NewEncoder(w).Encode(response)
+		_ = json.NewEncoder(w).Encode(response)
 	}))
 	defer server.Close()
 
 	client := NewClient("test-key", WithBaseURL(server.URL))
-	defer client.Close()
+	defer func() { _ = client.Close() }()
 
 	agentID, err := client.RegisterAgent("test-agent", "langchain")
 	if err != nil {
@@ -188,7 +188,7 @@ func TestRegisterAgent(t *testing.T) {
 
 func TestRegisterAgentEmptyName(t *testing.T) {
 	client := NewClient("test-key")
-	defer client.Close()
+	defer func() { _ = client.Close() }()
 
 	_, err := client.RegisterAgent("", "framework")
 	if err == nil {
@@ -236,7 +236,7 @@ func TestBatchAutoFlush(t *testing.T) {
 		var payload struct {
 			Events []Event `json:"events"`
 		}
-		json.NewDecoder(r.Body).Decode(&payload)
+		_ = json.NewDecoder(r.Body).Decode(&payload)
 
 		mu.Lock()
 		receivedCount += len(payload.Events)
@@ -251,7 +251,7 @@ func TestBatchAutoFlush(t *testing.T) {
 		WithBaseURL(server.URL),
 		WithBatchSize(5),
 	)
-	defer client.Close()
+	defer func() { _ = client.Close() }()
 
 	for i := 0; i < 10; i++ {
 		event := NewEvent(EventToolCall, "tool")