Implement policy tables and position encoding for NN inference (Phase 1.1-1.2)

CMakeLists.txt

@@ -202,6 +202,7 @@ endif()
 
 # Include directories
 include_directories(${CMAKE_CURRENT_SOURCE_DIR}/src)
+include_directories(${CMAKE_CURRENT_SOURCE_DIR})  # For proto/ includes
 if(USE_METAL AND METAL_CPP_AVAILABLE)
   include_directories(${METAL_CPP_DIR})
 endif()
@@ -277,7 +278,26 @@ endif()
 set(MCTS_SOURCES
     src/mcts/position_adapter.cpp src/mcts/position_classifier.cpp
     src/mcts/ab_integration.cpp src/mcts/thread_safe_mcts.cpp
-    src/mcts/parallel_hybrid_search.cpp src/mcts/apple_silicon_mcts.cpp)
+    src/mcts/parallel_hybrid_search.cpp src/mcts/apple_silicon_mcts.cpp
+    src/mcts/nn_mcts_evaluator.cpp)
+
+# Neural Network source files (Lc0-compatible inference)
+# Note: This is a stub implementation. Full implementation requires ~95k lines
+# See src/nn/README.md and IMPLEMENTATION_GUIDE.md for details
+#
+# Current status: Protobuf schema + policy tables + position encoding compiled
+# Stub files in src/nn/ are copied from lc0 but NOT adapted yet:
+#   - encoder.cpp, encoder.h, loader.cpp, loader.h, network.h
+#   These will NOT compile until adapted (see IMPLEMENTATION_GUIDE.md)
+set(NN_SOURCES
+    proto/net.pb.cc
+    src/nn/tables/policy_utils.cpp
+    src/nn/position_encoder.cpp)
+# TODO: Add when implemented and adapted:
+#   src/nn/loader.cpp
+# TODO: Metal backend when implemented:
+#   src/nn/metal/metal_backend.mm
+#   src/nn/metal/network_graph.mm
 
 # Metal GPU acceleration (macOS only)
 if(USE_METAL AND METAL_CPP_AVAILABLE)
@@ -328,17 +348,19 @@ set(SOURCES
     ${UCI_SOURCES}
     ${SYZYGY_SOURCES}
     ${GPU_SOURCES}
-    ${MCTS_SOURCES})
+    ${MCTS_SOURCES}
+    ${NN_SOURCES})
 
 # Create executable
 if(USE_CUDA AND CUDA_AVAILABLE)
   # CUDA executable with mixed source files
   add_executable(metalfish ${SOURCES} ${CUDA_SOURCES})
   set_target_properties(metalfish PROPERTIES CUDA_SEPARABLE_COMPILATION ON
                                              CUDA_RESOLVE_DEVICE_SYMBOLS ON)
-  target_link_libraries(metalfish ${CUDA_LINK_LIBRARIES})
+  target_link_libraries(metalfish ${CUDA_LINK_LIBRARIES} protobuf)
 else()
   add_executable(metalfish ${SOURCES})
+  target_link_libraries(metalfish protobuf)
 endif()
 
 # Add shader dependency if available
@@ -408,7 +430,8 @@ if(BUILD_TESTS)
       tests/test_gpu_module.cpp
       tests/test_metal.cpp
       tests/test_gpu_nnue.cpp
-      tests/test_cuda.cpp)
+      tests/test_cuda.cpp
+      tests/test_nn_comparison.cpp)
 
   if(USE_CUDA AND CUDA_AVAILABLE)
     # CUDA test executable
@@ -422,12 +445,13 @@ if(BUILD_TESTS)
       ${SYZYGY_SOURCES}
       ${GPU_SOURCES}
       ${MCTS_SOURCES}
+      ${NN_SOURCES}
       ${CUDA_SOURCES})
     set_target_properties(
       metalfish_tests PROPERTIES CUDA_SEPARABLE_COMPILATION ON
                                  CUDA_RESOLVE_DEVICE_SYMBOLS ON)
     target_link_libraries(metalfish_tests Threads::Threads
-                          ${CUDA_LINK_LIBRARIES})
+                          ${CUDA_LINK_LIBRARIES} protobuf)
   else()
     add_executable(
       metalfish_tests
@@ -438,8 +462,9 @@ if(BUILD_TESTS)
       ${UCI_SOURCES}
       ${SYZYGY_SOURCES}
       ${GPU_SOURCES}
-      ${MCTS_SOURCES})
-    target_link_libraries(metalfish_tests Threads::Threads)
+      ${MCTS_SOURCES}
+      ${NN_SOURCES})
+    target_link_libraries(metalfish_tests Threads::Threads protobuf)
   endif()
 
   if(APPLE