fix: preserve audio sample continuity across timestamp rounding

Sources/macOS/Output.mm

@@ -17,6 +17,11 @@ extern "C" {
 #include <stdexcept>
 #include <vector>
 
+#ifdef PLAYER_AUDIO_CHECK
+// Check builds observe the actual callback samples; release builds have no hook.
+extern void player_check_audio(const float *samples, size_t frames);
+#endif
+
 namespace {
 constexpr size_t capacity = 48000;
 double host_seconds(uint64_t ticks) {
@@ -258,6 +263,9 @@ struct Output::Impl {
         size_t first = std::min(frames, capacity - size_t(r % capacity));
         std::memcpy(destination, self.samples.data() + (r % capacity) * 2, first * 2 * sizeof(float));
         std::memcpy(destination + first * 2, self.samples.data(), (frames - first) * 2 * sizeof(float));
+        #ifdef PLAYER_AUDIO_CHECK
+        player_check_audio(destination, count);
+        #endif
         if (frames) {
             self.clockVersion.fetch_add(1, std::memory_order_acq_rel);
             self.anchorPTS.store(self.origin + double(r) / 48000, std::memory_order_relaxed);