Scope check

• This is core LLM communication (not application logic)
• This benefits most users (not just my use case)
• This can't be solved in application code with current RubyLLM
• I read the Contributing Guide

Due diligence

• I searched existing issues
• I checked the documentation

What problem does this solve?

It's very difficult to implement proper observability with a market leading tool like Langfuse right now.

Proposed solution

There needs to be a way to log every raw request/response.

Why this belongs in RubyLLM

This is a core use case for any serious LLM user building agentic systems. They are extremely hard to debug without proper observability.