Feat: really good lookahead mechanism for scheduling

src/engine/audio.rs

@@ -305,6 +305,8 @@ pub fn build_stream(
                 let buffer_samples = data.len() / channels;
                 let buffer_time_ns = (buffer_samples as f64 / sr as f64 * 1e9) as u64;
 
+                audio_sample_pos.fetch_add(buffer_samples as u64, Ordering::Release);
+
                 while let Ok(cmd) = audio_rx.try_recv() {
                     match cmd {
                         AudioCommand::Evaluate { cmd, time } => {
@@ -335,8 +337,6 @@ pub fn build_stream(
                 engine.process_block(data, &[], &[]);
                 scope_buffer.write(&engine.output);
 
-                audio_sample_pos.fetch_add(buffer_samples as u64, Ordering::Relaxed);
-
                 // Feed mono mix to analysis thread via ring buffer (non-blocking)
                 for chunk in engine.output.chunks(channels) {
                     let mono = chunk.iter().sum::<f32>() / channels as f32;