bxcore: a turn's speaker, SessionUpdated's turn, the session-state messages

Co-Authored-By: ornith-1.5-35b-a3b <agent@wntrmute.dev>

crates/bxcore/src/memory.rs

@@ -228,11 +228,30 @@ pub struct MemoryBlockReply {
     pub text: String,
 }
 
-/// `loopd` → `memoryd`: this session's log has new records.
+/// `loopd` → `memoryd`: this session's log has new records, those of a turn that has ended.
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(deny_unknown_fields)]
 pub struct SessionUpdated {
     pub session: SessionId,
+    /// The ended turn's number in the session (M5c spec, section 5). It has no default: a frame
+    /// without it is refused, never read as turn 0.
+    pub turn: u64,
+}
+
+/// `memoryd` → `brokerd`, on `state.sock`: the session's state now (M5c spec, section 7).
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(deny_unknown_fields)]
+pub struct SessionState {
+    pub session: SessionId,
+}
+
+/// `brokerd` → `memoryd`: the session's class, and whether it has read untrusted content. Neither
+/// field has a default: a reply without one is refused, never read as a clean session.
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(deny_unknown_fields)]
+pub struct SessionStateReply {
+    pub class: DataClass,
+    pub untrusted: bool,
 }
 
 /// `brokerd` → `memoryd`: a decided `recall` or `memory` call, with the session's state when it