Add post-grace peer recovery coordinator

src/network/mod.rs

@@ -200,6 +200,11 @@ pub trait RoomState: Send + Sync {
     /// active only after its normal signed `Announce` is received and verified.
     async fn rebootstrap_peers(&self, peers: Vec<EndpointAddr>) -> Result<(), NetError>;
 
+    /// Remove a peer from the authenticated live roster before background
+    /// recovery. This only revokes membership; a fresh verified `Announce` is
+    /// required to add the peer again.
+    fn mark_peer_disconnected(&self, peer_id: EndpointId);
+
     /// Broadcasts a room text-chat message authored by us (our display name is
     /// taken from the current self-state).
     async fn send_chat(&self, text: String) -> Result<(), NetError>;