load_sync_dbs() always tried zstd decompression, but pacman stores
.db files in varying formats (gzip, zstd, or decompressed). Now
detects format by magic bytes:
- \x28\xb5\x2f\xfd → zstd decompression
- \x1f\x8b → gzip decompression
- anything else → raw tar (already decompressed by hal sync)
Also bumped pkgrel 2→3 to trigger rebuild.
c-ludenberg