Fix lint warnings: drop deprecated Name field from snapshot response, check errcheck in benchmark

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

internal/hostagent/server.go

@@ -129,7 +129,6 @@ func (s *Server) CreateSnapshot(
 		return nil, connect.NewError(connect.CodeInternal, fmt.Errorf("create snapshot: %w", err))
 	}
 	return connect.NewResponse(&pb.CreateSnapshotResponse{
-		Name:      msg.Name,
 		SizeBytes: sizeBytes,
 	}), nil
 }

internal/id/id_test.go

@@ -113,6 +113,6 @@ func BenchmarkParseSandboxID(b *testing.B) {
 	s := FormatSandboxID(id)
 	b.ResetTimer()
 	for i := 0; i < b.N; i++ {
-		ParseSandboxID(s)
+		_, _ = ParseSandboxID(s)
 	}
 }