Starting point

src/CMakeLists.txt

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+add_subdirectory(core)

src/core/CMakeLists.txt

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+# Factory Core library
+add_library(factory_core STATIC
+    factory_core.cpp
+)
+
+# Add alias for consistent usage
+add_library(factory::core ALIAS factory_core)
+
+target_include_directories(factory_core
+    PUBLIC
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
+        $<INSTALL_INTERFACE:include>
+)
+
+target_link_libraries(factory_core
+    PUBLIC
+        flecs::flecs_static
+)
+
+# Set compile features
+target_compile_features(factory_core PUBLIC cxx_std_17)

src/core/factory_core.cpp

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+#include "factory_core.hpp"
+
+// Implementation file for factory_core
+// Currently empty as Core is header-only, but needed for static library target
+// Future implementations will go here

src/core/factory_core.hpp

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+#pragma once
+
+#include <flecs.h>
+
+namespace factory {
+
+// Core engine class wrapping flecs world
+class Core {
+public:
+    Core() : world_() {}
+
+    // Access the underlying flecs world
+    flecs::world& world() { return world_; }
+    const flecs::world& world() const { return world_; }
+
+    // Progress the simulation by one tick
+    bool progress(float delta_time = 0.0f) {
+        return world_.progress(delta_time);
+    }
+
+private:
+    flecs::world world_;
+};
+
+} // namespace factory