Refactored binary serializer to use a single wrapper slot per SGen type for both metadata registration and reference tracking. Removed slot-based IdentityMap arrays and scan pass tracking methods, replacing them with wrapper-based TryTrack logic. Updated generated code to use wrapper slots for all slot-based operations. Changed UseMetadata registration to use a MetadataSeen flag on the wrapper. Added fast slot-indexed wrapper access in context base. Default UseMetadata option is now false. Simplifies and optimizes SGen tracking, reducing dictionary lookups and unifying tracking logic.
