Code-health ratchet: plugins/platforms/telegram/adapter.py was 7446 lines > its 7422 cap after the
held-inbound hand-over (#132829) added adopt_held_inbound/_adopt_held_event. The whole hold queue
(_schedule_held_inbound_redispatch, _hold_inbound_event, adopt_held_inbound, _adopt_held_event,
_rehold_from, _redispatch_held_inbound) moves verbatim into TelegramHeldInboundMixin; TelegramAdapter
inherits it, so call sites and instance-level patches are unchanged. The sibling logs under the
adapter's logger name so existing log filters still match.