The percent-analysis scan listed 101 of 523 NVN entry points as missing. 72 were already implemented but declared with NVN_NOPROTO( (invisible to the scanner's ^NVN\( match), and 20 sampler getters came from a macro (SAMPLER_GETTERS). They are now plain NVN(name, ...) definitions, so the scan sees them.
nvnapi/nvn_protos_ext.h (new, included at the end of nvn_protos.h) carries prototypes for the entries the bundled NVN header lacks. 28 prototypes in nvn_protos.h that disagreed with the implementations (the NVN_NOPROTO ones had hidden the mismatch, e.g. MemoryPoolBuilderGetMemory returned void) were replaced by the implemented signature, marked "corrected".
New definitions: nvnCommandBuffer{Bind,Bind...Buffers,Begin,End,Pause,Resume,Draw}TransformFeedback and nvnSyncInitializeFromFencedGLSync / nvnSyncCreateGLSync. These are accepted and dropped (warn once); they have no Metal side. Still missing functionally.
internal.h: NVN_IMPL_SECTION is overridable (#ifndef) so an ELF host can build the API files.
multi-draw-indirect-count (nvnCommandBufferMultiDraw{Arrays,Elements}IndirectCount) already existed in api_cmd.c (OP_DRAW_IND_COUNT); no change needed.
scan.py NVN domain: 422/523 -> 523/523 (missing 101 -> 0 by its definition; 9 of those are no-op entries above).
unbuilt on macOS: everything (make -C gfx not run); -fsyntax-only with gcc passes for all api_*.c (api_memory.c only with stub Mach headers outside the tree, which cannot prove its Mach calls).