Quack protocol constants and codec entry point.
The actual encoder/decoder will live below this namespace. This module keeps protocol-level names in one place so message codecs, transport, and tests do not duplicate numeric ids.
Summary
Functions
@spec field_end() :: 65535
@spec message_type(atom()) :: non_neg_integer()
@spec message_types() :: %{required(atom()) => non_neg_integer()}
@spec optional_index_invalid() :: 18_446_744_073_709_551_615