gatewayd: a turn's speaker, the username of the one person who wrote its burst

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

crates/gatewayd/tests/deliver.rs

@@ -19,6 +19,7 @@ use tmp::TempDir;
 
 const DM: &str = "d0000000000000000000000000";
 const ROOT: &str = "r0000000000000000000000000";
+const KYLE: &str = "k0000000000000000000000000";
 
 #[derive(Default)]
 struct Record {
@@ -59,6 +60,7 @@ fn batch(resume: bool, text: &str) -> Batch {
         },
         resume,
         text: text.to_string(),
+        senders: vec![KYLE.to_string()],
     }
 }
 
@@ -73,6 +75,7 @@ fn run(dir: &TempDir, poster: &Record, batch: &Batch) -> Vec<String> {
         poster,
         &dir.path().join("loop.sock"),
         batch,
+        None,
         &|line| log.lock().unwrap().push(line.to_string()),
         &notice,
     );