Refactor Llama generator, helpers, and build assets

make Gemma 4 the default model, enable thinking mode
style updates

pipeline/includes/data_model/user_result.h

@@ -0,0 +1,22 @@
+#ifndef BIERGARTEN_PIPELINE_INCLUDES_DATA_MODEL_USER_RESULT_H_
+#define BIERGARTEN_PIPELINE_INCLUDES_DATA_MODEL_USER_RESULT_H_
+
+/**
+ * @file data_model/user_result.h
+ * @brief Generated user profile payload.
+ */
+
+#include <string>
+
+/**
+ * @brief Generated user profile payload.
+ */
+struct UserResult {
+   /// @brief Username handle.
+   std::string username;
+
+   /// @brief Short user biography.
+   std::string bio;
+};
+
+#endif  // BIERGARTEN_PIPELINE_INCLUDES_DATA_MODEL_USER_RESULT_H_