libSceVrHand technical debt

sceVrHandFinalize, sceVrHandGetMesh, sceVrHandGetMeshSize, sceVrHandGetResult, sceVrHandInitialize, sceVrHandStart, sceVrHandStop (libSceVrHand) - names and NIDs verified from pinned ps5rs stubs (libSceVrHand.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.
sceVrHandQueryMemory (libSceVrHand) - the meaning of the parameter and output fields is unknown. It follows firmware 13.42's libSceVrHand.sprx, read from its disassembly and run natively on x86-64 (not a console): a null pointer, an unreadable parameter, a first 32-bit parameter word other than 0x20, or any nonzero parameter byte from offset 4 to 31 returns 0x8a870006 and writes nothing; an unwritable result pointer returns 0x8a870006 (with possible partial output on copy-out failure). Otherwise it stores the 32-bit values 0x3c00000 and 0x10000 at output offsets 0 and 4, clears output bytes 8 to 27 and returns 0. Returning 0x8a870006 for unwritable or unreadable pointers is a defensive host-protection fallback; console behavior is unmeasured.