Fix lint errors: handle error return values

cmd/bd/deletion_tracking.go

@@ -54,7 +54,7 @@ func merge3WayAndPruneDeletions(ctx context.Context, store storage.Storage, json
 	// Ensure temp file cleanup on failure
 	defer func() {
 		if fileExists(tmpMerged) {
-			os.Remove(tmpMerged)
+			_ = os.Remove(tmpMerged)
 		}
 	}()
 

cmd/bd/import.go

@@ -545,7 +545,7 @@ func attemptAutoMerge(conflictedPath string) error {
 	if err != nil {
 		return fmt.Errorf("failed to create temp directory: %w", err)
 	}
-	defer os.RemoveAll(tmpDir)
+	defer func() { _ = os.RemoveAll(tmpDir) }()
 
 	basePath := filepath.Join(tmpDir, "base.jsonl")
 	leftPath := filepath.Join(tmpDir, "left.jsonl")

cmd/bd/message.go

@@ -202,7 +202,7 @@ func sendAgentMailRequest(config *AgentMailConfig, method string, params interfa
 	if err != nil {
 		return nil, fmt.Errorf("failed to connect to Agent Mail server: %w", err)
 	}
-	defer resp.Body.Close()
+	defer func() { _ = resp.Body.Close() }()
 
 	body, err := io.ReadAll(resp.Body)
 	if err != nil {

cmd/bd/migrate_issues.go

@@ -630,7 +630,7 @@ func displayMigrationPlan(plan migrationPlan, dryRun bool) error {
 func confirmMigration(plan migrationPlan) bool {
 	fmt.Printf("\nMigrate %d issues from %s to %s? [y/N] ", len(plan.IssueIDs), plan.From, plan.To)
 	var response string
-	fmt.Scanln(&response)
+	_, _ = fmt.Scanln(&response)
 	return strings.ToLower(strings.TrimSpace(response)) == "y"
 }
 
@@ -698,6 +698,6 @@ func init() {
 	migrateIssuesCmd.Flags().Bool("strict", false, "Fail on orphaned dependencies or missing repos")
 	migrateIssuesCmd.Flags().Bool("yes", false, "Skip confirmation prompt")
 
-	migrateIssuesCmd.MarkFlagRequired("from")
-	migrateIssuesCmd.MarkFlagRequired("to")
+	_ = migrateIssuesCmd.MarkFlagRequired("from")
+	_ = migrateIssuesCmd.MarkFlagRequired("to")
 }

cmd/bd/show.go

@@ -607,11 +607,11 @@ Examples:
 
 		// Write current value to temp file
 		if _, err := tmpFile.WriteString(currentValue); err != nil {
-			tmpFile.Close()
+			_ = tmpFile.Close()
 			fmt.Fprintf(os.Stderr, "Error writing to temp file: %v\n", err)
 			os.Exit(1)
 		}
-		tmpFile.Close()
+		_ = tmpFile.Close()
 
 		// Open the editor
 		editorCmd := exec.Command(editor, tmpPath)