Conversation key (keyFor): the chat id, or ${chatId}:${senderId} per group participant.
Shallow copy of the conversation's c.state (captured ask answers, ...).
True while the conversation is blocked waiting for the user's next message.
Messages buffered for the conversation that it has not consumed yet.
OptionalacceptsWhat the pending wait takes as an answer ('text', a list of message types,
or 'any'); undefined when not waiting or the wait did not declare it.
Read-only view of a live conversation (diagnostics / dev tooling).