refactor: read an entry's target as a function

The emulator card read entry_target from the consumers object, which the tests stand in for with a namespace. It is a module function now, and the pairing test resolves an archive member through it as the site does.

scripts/cross_reference.py

@@ -546,20 +546,6 @@ class FileConsumers:
             if member is not entry
         }
 
-    @staticmethod
-    def entry_target(entry: dict, files: list[dict]) -> tuple[dict, str]:
-        """The entry a profile entry resolves through, and its destination.
-
-        A ROM read inside an archive is the archive: FBNeo opens sm1.sm1 in
-        neogeo.zip, and resolved by its crc32 it credited a loose copy FBNeo
-        never opens, while no neogeo.zip card named FBNeo. The archive
-        members the profile reads decide between same-named copies, as in
-        the emulator pack and verify.
-        """
-        if entry.get("archive"):
-            return archive_entry(entry["archive"], files), ""
-        return with_archive_members(entry, files), entry.get("path") or ""
-
     def add_emulators(self, profiles: dict[str, dict]) -> None:
         """Each file a profile entry resolves to, a directory's members included.
 
@@ -588,13 +574,27 @@ class FileConsumers:
                         for dest, sha1 in members.items()
                     ]
                 else:
-                    found = [self.sha1_of(*self.entry_target(entry, files), owner=name)]
+                    found = [self.sha1_of(*entry_target(entry, files), owner=name)]
                 for sha1 in found:
                     if sha1:
                         self.emulators.setdefault(sha1, set()).add(name)
                         self.emulator_entries.setdefault(sha1, {}).setdefault(name, index)
 
 
+def entry_target(entry: dict, files: list[dict]) -> tuple[dict, str]:
+    """The entry a profile entry resolves through, and its destination.
+
+    A ROM read inside an archive is the archive: FBNeo opens sm1.sm1 in
+    neogeo.zip, and resolved by its crc32 it credited a loose copy FBNeo
+    never opens, while no neogeo.zip card named FBNeo. The archive
+    members the profile reads decide between same-named copies, as in
+    the emulator pack and verify.
+    """
+    if entry.get("archive"):
+        return archive_entry(entry["archive"], files), ""
+    return with_archive_members(entry, files), entry.get("path") or ""
+
+
 def entry_source(f: dict, index: dict) -> str | None:
     """Where the collection holds a profile entry, or None.