fix(node): name members admitted without an invitation name

A member who joined by link, by a new device or into an open group was
pinned in the roster with no name, so the audit log showed only the
first characters of their id. The hub's MNP token now carries the
account's username, and after the handshake the node writes it into the
roster for an account whose name is empty. An invitation's name is never
overwritten; the name is a label, authority stays on `sub`.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/packages/meshbay-node/src/meshbay_node/transport/webrtc/admin.py b/packages/meshbay-node/src/meshbay_node/transport/webrtc/admin.py
index 9a6cbd1..48734ab 100644
--- a/packages/meshbay-node/src/meshbay_node/transport/webrtc/admin.py
+++ b/packages/meshbay-node/src/meshbay_node/transport/webrtc/admin.py
@@ -157,6 +157,13 @@ class AdminMixin:
         if ident and not self._device_confirmed:
             self._pinned_pk = ident["pk_ed25519"]
 
+    async def _name_identity(self) -> None:
+        """Record the token's username for an account the roster has unnamed."""
+        roster = self._ctx.get("roster")
+        if roster is None or not self._user_id or not self._username:
+            return
+        await roster.name_identity(self._user_id, self._username)
+
     def _is_node_admin(self) -> bool:
         """
         Whether the **account** on this connection is the one the node belongs to.