The compile_mention_patterns promotion moved the 'patterns is None ->
return []' short-circuit into the shared helper, which meant the
telegram/dingtalk wrappers now evaluated self.name (via log_prefix=)
even on the no-patterns path. On main that path returned before
touching any adapter attributes; tests construct bare adapters via
object.__new__ that lack .platform, so TestTelegramGuestMentionGating
failed with AttributeError. Restore the early return in both wrappers
for exact behavior parity with main.
703fe94174