Action is situated
An isolated model does not exhaust the meaning of an interaction. The relevant question is how a response enters a particular context, which authority applies and what can still be reviewed after the fact.
A turn is a unit of responsibility
Turn-by-turn work asks what should be visible before and after an action: declared constraints, possible intervention and a bounded account of what happened.
This memorandum frames a research direction. It does not claim a completed operational standard or external validation.