Phase 3: engine render chain hop nhat — track/master doc mastering_settings.chain (imager/maximizer), PDC probe FX_LATENCIES, fix daw_vst_bridge link BuiltinFxChain, pytest 3.2/3.3

native_bridge/src/RenderFxJob.cpp

@@ -1016,6 +1016,17 @@ int run_render_fx_job(const std::string& jobPath, const std::string& inPath,
         sl.fx = std::move(fx);
     }
 
+    // 4b. Per-slot latency (PDC, Phase 3): vst3 = getLatencySamples() (0 nếu
+    // chưa load/bypass), builtin = 0. 1 dòng stdout để native_render parse →
+    // render_engine align track (cùng thứ tự mảng slots).
+    std::cout << "[RenderFx] FX_LATENCIES";
+    for (const auto& sl : slots) {
+        uint32_t lat = 0;
+        if (sl.vst && !sl.bypass && sl.fx) lat = (uint32_t)sl.fx->latencySamples();
+        std::cout << ' ' << lat;
+    }
+    std::cout << std::endl;
+
     // 5. Process chain block-wise. Double-buffered: cur ← slot → nxt, swap.
     std::vector<float> L0(chunk), R0(chunk), L1(chunk), R1(chunk);
     std::vector<float> curL(chunk), curR(chunk);