libSceMusicCoreInterface technical debt

sceMusicCoreIfInitializeInterface, sceMusicCoreIfSetFunctionTable, sceMusicCoreIfMainLoop, sceMusicCoreIfSetInternalFunctionTable, sceMusicCoreIfSetFunctionTableExt2, sceMusicCoreIfSetFunctionTableUnlimited and sceMusicCoreIfInternalInitializeInterface - names and NIDs are present in the PS5 13.60 export inventory. Parameter lists, return types and behavior are unverified; the parameterless int declarations are import-resolution placeholders, not verified ABI contracts. Every entry throws through NotImplemented_nid_no_patch. No MusicCore interface behavior is implemented.