Function maybe_print_resolved_lane 

pub fn maybe_print_resolved_lane(
    resolved: Option<&ResolvedLane>,
    nonce: u64,
) -> Result<()>

Prints lane: <name> (nonce_key=<key>, nonce=<n>) to stderr (so it doesn’t pollute stdout for commands like cast mktx whose stdout is meant to be piped), giving visibility into which 2D nonce lane was used.