pub fn compress_compact_frame(data: &[u8]) -> Result<Vec<u8>, HeddleError>Expand description
Compress one compact metadata frame with the measured lineage-solid policy.
Level 19 plus a 2^27-byte long-distance window matches the #1325 falsifier.
Incompressible input remains raw so the pack reader’s size discriminator is
unambiguous. Builds without zstd retain the lossless compact encoding but
store its frames raw.