Windows support

shared/Paths.h

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+#pragma once
+// Where things live on disk.
+//
+// Assets: a release package keeps them next to the executables
+// (`<exe dir>/assets` for the game, `<exe dir>/engine` for the engine's shaders,
+// fonts, textures and models); a development build falls back to the source
+// checkout paths baked in by CMake (BS_ASSET_DIR / HD2D_ENGINE_ASSET_DIR).
+
+#include <filesystem>
+#include <string>
+
+namespace bs {
+
+std::filesystem::path executableDir();
+// %APPDATA%\brandling-safari on Windows, $XDG_DATA_HOME/brandling-safari or
+// ~/.local/share/brandling-safari elsewhere. Created if missing.
+std::filesystem::path userDataDir();
+// Game asset root (contains characters/manifest.json).
+const std::string& gameAssetDir();
+
+}  // namespace bs