Arena debug visualization

src/commit_request.hpp

@@ -276,6 +276,12 @@ public:
    */
   size_t used_bytes() const { return arena_.used_bytes(); }
 
+  /**
+   * @brief Get access to the underlying arena allocator for debugging.
+   * @return Reference to the arena allocator
+   */
+  const ArenaAllocator &arena() const { return arena_; }
+
   /**
    * @brief Reset the commit request for reuse.
    */