feat(matrix): add adapter baseline and platform-aware command hints

adapter/matrix/handlers/auth.py

@@ -0,0 +1,34 @@
+from __future__ import annotations
+
+from typing import Any
+
+from adapter.matrix.store import get_room_meta, set_room_meta
+
+
+async def handle_invite(client: Any, room: Any, event: Any, platform, store, auth_mgr) -> None:
+    existing = await get_room_meta(store, room.room_id)
+    if existing is not None:
+        return
+
+    user = await platform.get_or_create_user(
+        external_id=getattr(event, "sender", ""),
+        platform="matrix",
+        display_name=getattr(room, "display_name", None),
+    )
+    await auth_mgr.confirm(getattr(event, "sender", ""))
+    await client.join(room.room_id)
+    await set_room_meta(
+        store,
+        room.room_id,
+        {
+            "room_type": "chat",
+            "chat_id": "C1",
+            "display_name": getattr(room, "display_name", room.room_id),
+            "matrix_user_id": getattr(event, "sender", user.external_id),
+        },
+    )
+    message = (
+        f"Привет, {user.display_name or user.external_id}! Пиши — я здесь.\n\n"
+        f"Команды: !new · !chats · !rename · !archive · !skills"
+    )
+    await client.room_send(room.room_id, "m.room.message", {"msgtype": "m.text", "body": message})