v5.3.0

Changed

• The multihash codec (MultihashAlgorithm, createMultihash,
  decodeMultihash) now comes from @interop/data-integrity-core/multihash
  (^8.6.0) and is re-exported from src/utils/multiformats.ts; the local
  implementation is gone. Byte behavior is unchanged; varint decoding is
  stricter (overlong and oversized varints are rejected) and decoding refuses
  trailing bytes after the digest.

Removed

• DIGEST_LENGTHS is no longer exported (it had no consumers outside the
  module; the shared codec keeps it internal).