kui-value

kui's plain-data payload: Value (null, bool, int, float, string, list, an ordered string-keyed map), a strict JSON reader into it, the MessageField conversions a typed message is built from, and — behind features — its Lua conversions (lua) and #[derive(Message)] (derive).

It depends on no other kui crate, so what has no kui core — the data channel (kui-channel), the recording's reader (kui-trace) — speaks the same values. kui-core re-exports all of it where it always was: kui_core::Value, kui_core::json, kui_core::message. See ADR 0075, decision 3.