fix(go): batch durable spool replay

go/vehicle-gateway/internal/eventbus/durable_sink_test.go

@@ -118,6 +118,26 @@ func TestDurableSinkReplayLoopTickUsesUncancelledContext(t *testing.T) {
 	}
 }
 
+func TestDurableSinkReplayLoopTickRespectsBatchSize(t *testing.T) {
+	dir := t.TempDir()
+	env := durableTestEnvelope()
+	for index := 0; index < 5; index++ {
+		writeDurableRecord(t, filepath.Join(dir, "000"+string(rune('1'+index))+"-raw.json"), durableRecord{Kind: "raw", Envelope: env})
+	}
+	delegate := &contextCheckingReplaySink{}
+	sink := NewDurableSink(delegate, DurableConfig{Directory: dir, ReplayBatchSize: 2})
+
+	if err := sink.replayOnceFromLoop(context.Background()); err != nil {
+		t.Fatalf("replayOnceFromLoop() error = %v", err)
+	}
+	if delegate.rawCalls != 2 {
+		t.Fatalf("raw calls = %d, want 2", delegate.rawCalls)
+	}
+	if files := spoolFiles(t, dir); len(files) != 3 {
+		t.Fatalf("spool files after replay = %d, want 3: %#v", len(files), files)
+	}
+}
+
 func durableTestEnvelope() envelope.FrameEnvelope {
 	return envelope.FrameEnvelope{
 		Protocol:     envelope.ProtocolJT808,