feat(roms): add romhack drop-folder importer; import 53 hacks

romhack-import.py: classifies a mixed drop folder (ROMs/patches/docs/archives),
clean-names ROMs to 'Pokemon - <Hack> (Hack)', auto-detects patch base via
BPS/UPS CRC, recurses zips/rar, archives patches+docs. Imported the pokemon/
drop (now gitignored) into the valhalla library + Following Renegade Platinum.
Updated wanted-list for newly acquired hacks.

.gitignore

@@ -11,5 +11,9 @@ Thumbs.db
 *.tmp
 *.log
 
+# ROM-hack drop folder — large binaries processed into the valhalla library by
+# scripts/romhack-import.py; never commit the ROMs themselves.
+pokemon/
+
 # Personal, per-machine Claude Code overrides (not team config)
 .claude/settings.local.json