feat: recalbox 346/346 via md5_composite, add mame variants

Add md5_composite() to verify.py replicating Recalbox Zip::Md5Composite
(sorted filenames, sequential content hash). Independent of ZIP
compression level, resolves all 9 MAME arcade untested entries.

Add Recalbox-specific MAME ZIP variants from Recalbox 10 pack.
Batocera 671/680 (9 untested MAME-specific), all others 100%.

scripts/common.py

@@ -54,6 +54,21 @@ def md5sum(filepath: str | Path) -> str:
     return h.hexdigest()
 
 
+def md5_composite(filepath: str | Path) -> str:
+    """Compute composite MD5 of a ZIP - matches Recalbox's Zip::Md5Composite().
+
+    Sorts filenames alphabetically, reads each file's contents in order,
+    feeds everything into a single MD5 hasher. The result is independent
+    of ZIP compression level or metadata.
+    """
+    with zipfile.ZipFile(filepath) as zf:
+        names = sorted(n for n in zf.namelist() if not n.endswith("/"))
+        h = hashlib.md5()
+        for name in names:
+            h.update(zf.read(name))
+        return h.hexdigest()
+
+
 def load_platform_config(platform_name: str, platforms_dir: str = "platforms") -> dict:
     """Load a platform config with inheritance and shared group resolution.
 

scripts/verify.py

@@ -28,7 +28,7 @@ except ImportError:
     sys.exit(1)
 
 sys.path.insert(0, os.path.dirname(__file__))
-from common import load_platform_config, md5sum
+from common import load_platform_config, md5sum, md5_composite
 
 DEFAULT_DB = "database.json"
 DEFAULT_PLATFORMS_DIR = "platforms"
@@ -192,6 +192,18 @@ def verify_entry_md5(file_entry: dict, local_path: str | None) -> dict:
         if len(expected) < 32 and actual_lower.startswith(expected.lower()):
             return {"name": name, "status": Status.OK, "path": local_path}
 
+    # Recalbox uses Zip::Md5Composite() for ZIP files: sorts filenames,
+    # hashes all contents sequentially. Independent of compression level.
+    if local_path.endswith(".zip"):
+        try:
+            composite = md5_composite(local_path)
+            composite_lower = composite.lower()
+            for expected in md5_list:
+                if composite_lower == expected.lower():
+                    return {"name": name, "status": Status.OK, "path": local_path}
+        except (zipfile.BadZipFile, OSError):
+            pass
+
     return {
         "name": name, "status": Status.UNTESTED, "path": local_path,
         "expected_md5": md5_list[0] if md5_list else "", "actual_md5": actual_md5,