Add memory system session context API

memory_system_api/clients.py

@@ -180,6 +180,12 @@ class OpenVikingMemorySystemClient:
             response.raise_for_status()
             return response.json()
 
+    async def get_session_context(self, credential: OpenVikingCredential | str, session_id: str) -> dict[str, Any]:
+        async with self._credential_client(credential) as client:
+            response = await client.get(f"/api/v1/sessions/{session_id}/context")
+            response.raise_for_status()
+            return response.json()
+
     def _credential_client(self, credential: OpenVikingCredential | str) -> httpx.AsyncClient:
         if isinstance(credential, str):
             return self._client(credential)