Gateway tests build adapters via object.__new__() without __init__ (the
documented bare-instance pattern), so the new _status_text dict must be
accessed through getattr guards in set_status_text, the _keep_typing
finally cleanup, and the Slack send_typing read — same treatment as
other post-hoc __init__ attributes. Fixes CI shard 2/8
(test_active_session_text_merge).
d8fd45e9a8