libSceSaveData technical debt

libSceSaveData is built from the libSceSaveData.native sources, so a title that imports save data from libSceSaveData, as PS4 titles do, gets the same functions. The separate implementation it had before kept save-data memory in _sd/sce_sdmemory/<user>/memory.dat and mount aliases in _sd/_aliases; neither is read, so memory saved through that library is not found

Additional callable exports - 14 entries present in both version-labelled images are import-resolution declarations only. None is listed in the pinned public 3.20 catalogue for this library. Neither label independently authenticates retail firmware provenance. Parameter lists, return types and behavior are unverified; parameterless int declarations are placeholders, not verified ABI contracts. Every entry throws through NotImplemented_nid_no_patch. Unidentified names use literal NID aliases. No runtime functionality is implemented. Data exports require separate layout and ownership analysis. Identified candidate names match their NIDs in the public symbol database or supplemental catalog.