derive per-agent egress entries from operator-linked accounts

swarm-controller/src/matrix_account.rs

@@ -180,6 +180,15 @@ pub async fn put_matrix_account(
     let user_id = link_matrix(&store, &secret_path, &existing(&agent, &account), &req)
         .await
         .map_err(|b| *b)?;
+    crate::link_egress::added(
+        &state,
+        &agent,
+        &crate::link_egress::Link::Matrix {
+            account: &account,
+            homeserver: req.homeserver.as_deref(),
+        },
+    )
+    .await?;
 
     tracing::info!(%hive, %agent, %account, "credential stored");
     Ok(Json(PutMatrixAccountResponse { user_id }))