Update all .cpp files to use .cc extension (google style)

pipeline/src/data_generation/llama/load_brewery_prompt.cc

@@ -0,0 +1,59 @@
+/**
+ * @file data_generation/llama/load_brewery_prompt.cc
+ * @brief Resolves brewery system prompt content from cache or a configured
+ * filesystem path and provides a robust inline fallback prompt when absent.
+ */
+
+#include <spdlog/spdlog.h>
+
+#include <filesystem>
+#include <fstream>
+#include <stdexcept>
+
+#include "data_generation/llama_generator.h"
+
+namespace fs = std::filesystem;
+
+/**
+ * @brief Loads brewery system prompt from disk or cache.
+ *
+ * @param prompt_file_path Preferred prompt file location.
+ * @return Prompt text loaded from disk.
+ */
+std::string LlamaGenerator::LoadBrewerySystemPrompt(
+    const std::string& prompt_file_path) {
+  // Return cached version if already loaded
+  if (!brewery_system_prompt_.empty()) {
+    return brewery_system_prompt_;
+  }
+
+  // Try the provided path only
+  const fs::path prompt_path(prompt_file_path);
+  std::ifstream prompt_file(prompt_path);
+  if (!prompt_file.is_open()) {
+    spdlog::error(
+        "LlamaGenerator: Failed to open brewery system prompt file '{}'",
+        prompt_path.string());
+    throw std::runtime_error(
+        "LlamaGenerator: missing brewery system prompt file: " +
+        prompt_path.string());
+  }
+
+  const std::string prompt((std::istreambuf_iterator(prompt_file)),
+                           std::istreambuf_iterator<char>());
+  prompt_file.close();
+
+  if (prompt.empty()) {
+    spdlog::error("LlamaGenerator: Brewery system prompt file '{}' is empty",
+                  prompt_path.string());
+    throw std::runtime_error(
+        "LlamaGenerator: empty brewery system prompt file: " +
+        prompt_path.string());
+  }
+
+  spdlog::info(
+      "LlamaGenerator: Loaded brewery system prompt from '{}' ({} chars)",
+      prompt_path.string(), prompt.length());
+  brewery_system_prompt_ = prompt;
+  return brewery_system_prompt_;
+}