Fix variant name indexing: files in .variants/ now indexed under
canonical name (naomi2.zip instead of naomi2.zip.da79eca4).
Fix .zip detection for variant paths in verify.py.
Add composite MD5 matching in resolver for ZIP variants.
Add hikaru.zip (MAME 0.285, 6 ROMs) and segaboot.gcm (Triforce)
from archive.org. Both match Batocera expected MD5s.
Batocera 679/680 (1 untested: sc3000 private dump)
Recalbox 346/346 (100%)