hal: fix load_sync_dbs zstd crash on live ISO

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.

packages/hal/PKGBUILD

@@ -2,7 +2,7 @@
 
 pkgname=hal
 pkgver=0.2.0
-pkgrel=2
+pkgrel=3
 pkgdesc="HAL 9000 — Antergos NeXT Package Manager. Dual-mode: wrapper (pacman) or native (standalone)."
 arch=('any')
 url="https://github.com/Antergos-NeXT"

packages/hal/hal

@@ -367,9 +367,18 @@ def load_sync_dbs() -> Dict[str, dict]:
     for db_path in sorted(SYNC_DIR.glob("*.db")):
         try:
             with open(db_path, "rb") as f:
+                header = f.read(4)
+                f.seek(0)
+                reader = None
+                if header[:4] == b"\x28\xb5\x2f\xfd":
                     import zstandard
                     dctx = zstandard.ZstdDecompressor()
-                with dctx.stream_reader(f) as reader:
+                    reader = dctx.stream_reader(f)
+                elif header[:2] == b"\x1f\x8b":
+                    import gzip
+                    reader = gzip.GzipFile(fileobj=f)
+                else:
+                    reader = f
                 with tarfile.open(fileobj=reader, mode="r|") as tar:
                         current_dir = None
                         entry_data = {}