wrap up before restructure

media/docs/server-pipeline.dot

@@ -68,4 +68,9 @@ digraph server_pipeline {
     // Python reads files
     aac_file -> audio_extract [label="reads" style=dashed]
     active_session -> python [label="discovers\nsession dir" style=dashed]
+
+    // Known regression (2026-04-10)
+    regression [label="⚠ REGRESSED\n─────────────\nScene relay (separate pipe)\nbreaks 'one behind' flush.\ntry_send drops → decoder\ncorruption until keyframe.\n\nFix: move scene detection\ninto server ffmpeg as 3rd\noutput branch (10-scene-\ndetect-to-rust.md)"
+                shape=note fillcolor="#3d1e1e" color="#f38ba8" fontcolor="#f38ba8"]
+    scene_relay -> regression [style=dashed color="#f38ba8"]
 }