v0.17.0

Added

• yabase/intid gains checksum-bearing _check variants for the
  Crockford Base32 and Base58Check codecs, removing the
  Int → BitArray → encode_check / decode_check → BitArray → Int
  dance every caller previously reimplemented. New helpers:
  encode_int_base32_crockford_check,
  decode_int_base32_crockford_check[_bounded],
  encode_int_base58check,
  decode_int_base58check[_bounded]. The decoders surface
  Error(InvalidChecksum) on a mistyped input — the whole reason
  callers reach for the checksummed variant. Base58Check is fixed at
  version byte 0 (Bitcoin mainnet P2PKH); callers who need a
  different version still drop to yabase/base58check directly. (#73)
• yabase/intid and the top-level yabase module now re-export
  CodecError as a public type alias, so callers who only
  import yabase/intid (or only import yabase) can type-annotate a
  wrapper around decode_int_* / encode / decode without reaching
  into yabase/core/error. The alias preserves type identity (it
  resolves to the same CodecError the underlying functions already
  return), so existing code keeps working unchanged. (#74)