Function encode_tile_with 

pub fn encode_tile_with(
    layers: &[ColumnarLayer],
    cfg: &EncoderConfig,
) -> Result<Vec<u8>>

encode_tile with a fully-explicit EncoderConfig — no process-wide globals are read. The concurrency- and multi-config-safe entry point a dynamic per-request tile server uses so each dataset/request encodes with its own settings without touching shared state.