Function attach_recording 

pub fn attach_recording(
    builder: OptionsBuilder,
) -> (OptionsBuilder, Arc<Mutex<TraceLog>>)

Install inbound + outbound wire-tee callbacks on a builder so the resulting forge_sdk::Options captures every stream-json line the SDK exchanges with the claude subprocess. Returns the configured builder + a shared handle to the trace log. Wire capture is a spawn-time configuration concern, not a transport-injection one.