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

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

crates/loopd/src/memory.rs

@@ -94,6 +94,8 @@ impl MemorySource for MemoryPort {
     fn updated(&self, session: &SessionId) -> Result<(), String> {
         match self.ask(Message::SessionUpdated(SessionUpdated {
             session: session.clone(),
+            // Set in M5c-1 task 02. `memoryd` does not read it before M5c-1 task 09.
+            turn: 0,
         }))? {
             Message::Ok(_) => Ok(()),
             Message::Error(e) => Err(format!("memoryd: {}", e.detail)),

crates/loopd/src/turn.rs

@@ -123,6 +123,9 @@ pub fn run_turn(
         .append(LogRecord::User {
             time: Timestamp::now(),
             content: neutralise(content).into_owned(),
+            // Set in M5c-1 task 02, from the turn. `None` is not written: the record's bytes
+            // are as before.
+            speaker: None,
         })
         .map_err(TurnError::Session)?;