fix: preserve invite workspace bootstrap semantics

adapter/matrix/handlers/auth.py

@@ -29,6 +29,7 @@ async def provision_workspace_chat(
     store,
     auth_mgr,
     chat_mgr,
+    room_name_override: str | None = None,
 ) -> dict:
     user = await platform.get_or_create_user(
         external_id=matrix_user_id,
@@ -59,8 +60,9 @@ async def provision_workspace_chat(
         user_meta["space_id"] = space_id
         await set_user_meta(store, matrix_user_id, user_meta)
 
-    chat_id = await next_chat_id(store, matrix_user_id)
-    room_name = _default_room_name(chat_id)
+    next_chat_index = int(user_meta.get("next_chat_index", 1))
+    chat_id = f"C{next_chat_index}"
+    room_name = room_name_override or _default_room_name(chat_id)
     chat_resp = await client.room_create(
         name=room_name,
         visibility=RoomVisibility.private,
@@ -83,6 +85,10 @@ async def provision_workspace_chat(
         state_key=chat_room_id,
     )
 
+    user_meta["space_id"] = space_id
+    user_meta["next_chat_index"] = next_chat_index + 1
+    await set_user_meta(store, matrix_user_id, user_meta)
+
     await set_room_meta(
         store,
         chat_room_id,
@@ -122,15 +128,20 @@ async def handle_invite(client: Any, room: Any, event: Any, platform, store, aut
     if existing and existing.get("space_id"):
         return
 
-    created = await provision_workspace_chat(
-        client,
-        matrix_user_id,
-        display_name,
-        platform,
-        store,
-        auth_mgr,
-        chat_mgr,
-    )
+    try:
+        created = await provision_workspace_chat(
+            client,
+            matrix_user_id,
+            display_name,
+            platform,
+            store,
+            auth_mgr,
+            chat_mgr,
+            room_name_override="Чат 1",
+        )
+    except RuntimeError as exc:
+        logger.error("invite_workspace_provision_failed", user=matrix_user_id, error=str(exc))
+        return
 
     welcome = (
         f"Привет, {created['user'].display_name or matrix_user_id}! Пиши — я здесь.\n\n"