Function parse_bam_from_reader 

pub fn parse_bam_from_reader<R: Read>(
    reader: R,
) -> Result<QueryHeader, ParseError>

Parse a BAM header from any reader (no file path required).

This enables parsing from in-memory buffers (e.g. Cursor<Vec<u8>>) without writing to a temporary file. Only the header is read; the reader does not need to contain complete record data.

Errors

Returns ParseError::Noodles if the BAM header cannot be parsed, ParseError::InvalidFormat if no contigs are found, or ParseError::TooManyContigs if the limit is exceeded.