encode_m 3.0.0

EncodeM v3.0 brings complete M language (MUMPS) subscript encoding to Ruby, supporting numbers, strings, and composite keys with perfect sort order. Build hierarchical database keys like M("users", 42, "email") that sort correctly as raw bytes. This 40-year production-tested algorithm from YottaDB/GT.M powers Epic (70% of US hospitals) and VistA. Perfect for B-tree indexes, key-value stores, and any system requiring sortable hierarchical keys. All types maintain correct ordering when compared as byte strings - no decoding needed.