Function decode_market_data 

pub fn decode_market_data(
    buf: &[u8],
) -> Result<MarketDataMessage, StreamDecodeError>

Decode an SBE binary frame into a market data message.

Validates the message header (including schema ID) and routes to the appropriate decoder based on template ID.

Errors

Returns an error if the buffer is too short, schema validation fails, or the template ID is unknown.