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/wire.rs

@@ -2,7 +2,8 @@ use serde::{Deserialize, Serialize};
 
 use crate::gateway::{ApprovalOutcome, ApprovalPosted, ApprovalReply, ApprovalRequest};
 use crate::memory::{
-    MemoryAdmin, MemoryAdminReply, MemoryBlockReply, MemoryCall, Reindexed, SessionUpdated,
+    MemoryAdmin, MemoryAdminReply, MemoryBlockReply, MemoryCall, Reindexed, SessionState,
+    SessionStateReply, SessionUpdated,
 };
 use crate::{CallId, DataClass, DecisionRecord, SessionId, Timestamp, Usage};
 
@@ -51,6 +52,8 @@ pub enum Message {
     Reindexed(Reindexed),
     MemoryAdmin(MemoryAdmin),
     MemoryAdminReply(MemoryAdminReply),
+    SessionState(SessionState),
+    SessionStateReply(SessionStateReply),
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
@@ -126,13 +129,18 @@ pub enum DenyReason {
     StateUnreadable,
 }
 
-// JSON: {"kind":"turn","body":{"session":"…","content":"…","resume":false}}
+// JSON: {"kind":"turn","body":{"session":"…","content":"…","resume":false,"speaker":"kyle"}}
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(deny_unknown_fields)]
 pub struct Turn {
     pub session: SessionId,
     pub content: String,
     pub resume: bool,
+    /// Who spoke the turn, when one person did (M5c spec, section 11). Written only when present,
+    /// and a frame without it reads as `None`, the safe side: a turn without a speaker is never
+    /// synced to Honcho.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub speaker: Option<String>,
 }
 
 // JSON: {"event":"content","text":"…"} — the tag sits beside the fields, snake_case