Function setup_logging 

pub fn setup_logging(
    name: Option<&str>,
    error_capture: Option<Arc<Mutex<Vec<BenchAgentError>>>>,
) -> Result<()>

Sets up the logging infrastructure for the application. This includes:

• File-based logging with JSON formatting (DEBUG level)
• No console output (all logs go to files only)
• Optional Langfuse integration (DEBUG level)
• Optional error capture layer for benchmarking