fix: rank same-named archives by what they hold

The name step only ranked archive copies by members declared
through archive sub-entries, and the contents an archive entry lists
never reached the resolver, so the first copy indexed won. contents
now ranks copies by crc32, or by member name where the code opens
by name, and the report and both extra passes carry it. With no
layout declared, a primary holding every ROM of the others wins;
two revisions keep the index order.

scripts/packextras.py

@@ -776,6 +776,8 @@ def _collect_emulator_extras(
             for identity in PROFILE_IDENTITY_FIELDS:
                 if f.get(identity) not in (None, "", []):
                     extra[identity] = f[identity]
+            if f.get("contents"):
+                extra["contents"] = f["contents"]
             extra["claim_order"] = (2, 0, emu_name)
             if _take(extra, full_dest, seen_dests, taken):
                 extras.append(extra)
@@ -823,6 +825,10 @@ def _report_extra(u: dict, name: str, dest: str) -> dict:
     }
     if u.get("members"):
         extra["members"] = u["members"]
+    # The archive layout the core opens ranks same-named copies by what
+    # they hold; without it the first copy indexed won.
+    if u.get("contents"):
+        extra["contents"] = u["contents"]
     # Keep every reproducible identity constraint carried by the source
     # profile.  Some profiles expose CRC32/SHA-256 only through their
     # validation block; dropping those fields here would let a same-named