libScePfs technical debt

scePfsGetBlockTableReadCommand, scePfsGetHeaderReadCommand, scePfsGetPreadBlockRange, scePfsGetSingleBlockReadCommand, scePfsGetUncompressedSize, scePfsGetWorkBufferSize, scePfsPread, scePfsPreadDecompressBlock, scePfsValidate (libScePfs) - names and NIDs verified from pinned ps5rs stubs (libScePfs.txt), with NID match confirmed via tools/nid_names.py compute_nid. Signatures, parameter layouts, and runtime behavior remain unverified; all paths throw through NotImplemented_nid_no_patch.