T12: native audio loop SPSC + WASAPI (exclusive/shared, zero-lock audio thread, SendNote -> SPSC)

native_host/CMakeLists.txt

@@ -32,6 +32,20 @@ target_compile_definitions(vst3_host_bridge PRIVATE
     NOMINMAX
     WIN32_LEAN_AND_MEAN
 )
+target_link_libraries(vst3_host_bridge PRIVATE audio_engine)
+
+# Native audio loop (T12): SPSC + WASAPI — dùng chung cho cả 2 bridge.
+add_library(audio_engine STATIC
+    AudioEngine.cpp
+)
+target_include_directories(audio_engine PUBLIC native_host)
+target_compile_definitions(audio_engine PRIVATE
+    _CRT_SECURE_NO_WARNINGS
+    NOMINMAX
+    WIN32_LEAN_AND_MEAN
+    _WIN32_WINNT=0x0601
+)
+target_link_libraries(audio_engine PUBLIC ole32 avrt)
 
 # VST2 host bridge — chỉ cần vestige.h clean-room, không cần SDK.
 add_library(vst2_host_bridge SHARED
@@ -43,3 +57,4 @@ target_compile_definitions(vst2_host_bridge PRIVATE
     NOMINMAX
     WIN32_LEAN_AND_MEAN
 )
+target_link_libraries(vst2_host_bridge PRIVATE audio_engine)