session-start and room-joined synthetic notices via generic notices list

src/shard.rs

@@ -85,7 +85,7 @@ pub struct ShardSession {
     /// Last time a turn finished.
     last_used: Instant,
     /// Number of turns processed.
-    turn_count: u32,
+    pub turn_count: u32,
     /// Rooms we've sent at least one turn for in this session. Used to decide
     /// whether to include `previously_seen` context in a turn.
     pub rooms_seen: HashSet<OwnedRoomId>,