Switch to unified AP activity bus

emit_event → emit_activity for login event. Update shared submodule.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

bp/auth/routes.py

@@ -27,7 +27,7 @@ from shared.config import config
 from shared.utils import host_url
 from shared.infrastructure.urls import federation_url
 from shared.infrastructure.cart_identity import current_cart_identity
-from shared.events import emit_event
+from shared.events import emit_activity
 from shared.services.registry import services
 
 from .services import (
@@ -140,12 +140,12 @@ def register(url_prefix="/auth"):
                     if u2:
                         u2.last_login_at = now
                     if anon_session_id:
-                        await emit_event(
+                        await emit_activity(
                             s,
-                            "user.logged_in",
-                            "user",
-                            user_id,
-                            {
+                            activity_type="rose:Login",
+                            actor_uri="internal:system",
+                            object_type="Person",
+                            object_data={
                                 "user_id": user_id,
                                 "session_id": anon_session_id,
                             },