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%)
Critical: stream large file downloads (OOM fix), fix basename match
in auto_fetch, include hashes in pack grouping fingerprint, handle
not_in_zip status in verify, fix escaped quotes in batocera parser.
Important: deduplicate shared group includes, catch coreinfo network
errors, fix NODEDUP path component match, fix CI word splitting on
spaces, replace bare except Exception in 3 files.
Minor: argparse in list_platforms, specific exceptions in download.py.
