loopd: a turn's speaker in the log, its number in SessionUpdated

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

crates/loopd/src/memory.rs

@@ -22,8 +22,9 @@ pub const MEMORY_WAIT: Duration = Duration::from_secs(10);
 pub trait MemorySource: Send + Sync {
     /// The block for a new session. `Err` ends in `UNAVAILABLE`: no session starts without it.
     fn block(&self) -> Result<String, String>;
-    /// The session has new records; best effort, a failure is only logged by the caller.
-    fn updated(&self, session: &SessionId) -> Result<(), String>;
+    /// The session's turn number `turn` has ended, and its records are in the log; best effort,
+    /// a failure is only logged by the caller.
+    fn updated(&self, session: &SessionId, turn: u64) -> Result<(), String>;
 }
 
 /// No memory: for tests and the self-test, never for `loopd serve`.
@@ -33,7 +34,7 @@ impl MemorySource for NoMemory {
     fn block(&self) -> Result<String, String> {
         Ok(String::new())
     }
-    fn updated(&self, _session: &SessionId) -> Result<(), String> {
+    fn updated(&self, _session: &SessionId, _turn: u64) -> Result<(), String> {
         Ok(())
     }
 }
@@ -91,11 +92,10 @@ impl MemorySource for MemoryPort {
         }
     }
 
-    fn updated(&self, session: &SessionId) -> Result<(), String> {
+    fn updated(&self, session: &SessionId, turn: u64) -> 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,
+            turn,
         }))? {
             Message::Ok(_) => Ok(()),
             Message::Error(e) => Err(format!("memoryd: {}", e.detail)),