Add bounded CPU VAD diagnostic with real model contract tests

tools/speech-vad/CMakeLists.txt

@@ -0,0 +1,23 @@
+cmake_minimum_required(VERSION 3.21)
+project(searchi_vad_diagnostic LANGUAGES C CXX)
+if(NOT WHISPER_SOURCE)
+  message(FATAL_ERROR "Provide the pinned WHISPER_SOURCE checkout")
+endif()
+find_package(Git REQUIRED)
+execute_process(COMMAND "${GIT_EXECUTABLE}" -C "${WHISPER_SOURCE}" rev-parse HEAD
+  OUTPUT_VARIABLE whisper_revision OUTPUT_STRIP_TRAILING_WHITESPACE
+  RESULT_VARIABLE revision_status)
+if(NOT revision_status EQUAL 0 OR NOT whisper_revision STREQUAL "d1be6fde11ac6e0407606b4e42fe72d34add8037")
+  message(FATAL_ERROR "Diagnostic requires the frozen whisper.cpp revision")
+endif()
+set(BUILD_SHARED_LIBS OFF CACHE BOOL "" FORCE)
+set(GGML_BACKEND_DL OFF CACHE BOOL "" FORCE)
+foreach(provider CUDA VULKAN METAL SYCL HIP BLAS)
+  set(GGML_${provider} OFF CACHE BOOL "" FORCE)
+endforeach()
+set(WHISPER_BUILD_EXAMPLES OFF CACHE BOOL "" FORCE)
+set(WHISPER_BUILD_TESTS OFF CACHE BOOL "" FORCE)
+add_subdirectory("${WHISPER_SOURCE}" whisper)
+add_executable(searchi-vad-diagnostic diagnostic.cpp)
+target_compile_features(searchi-vad-diagnostic PRIVATE cxx_std_17)
+target_link_libraries(searchi-vad-diagnostic PRIVATE whisper)