Add memory system session context API

tests/test_memory_system_clients.py

@@ -255,6 +255,49 @@ def test_openviking_search_uses_session_target_uri():
     ]
 
 
+def test_openviking_get_session_context_uses_user_key_auth():
+    client = OpenVikingMemorySystemClient(store=FakeStore())
+    calls = []
+    responses = [
+        FakeResponse(
+            200,
+            {
+                "status": "ok",
+                "result": {
+                    "latest_archive_overview": "# Working Memory",
+                    "messages": [],
+                },
+            },
+        )
+    ]
+    client._client = lambda api_key, extra_headers=None: FakeAsyncClient(  # type: ignore[method-assign]
+        calls,
+        responses,
+        api_key,
+        extra_headers or {},
+    )
+    credential = client.user_credential("tom-key", "tom", agent_id="sess-1")
+
+    result = asyncio.run(client.get_session_context(credential, "sess-1"))
+
+    assert result == {
+        "status": "ok",
+        "result": {
+            "latest_archive_overview": "# Working Memory",
+            "messages": [],
+        },
+    }
+    assert calls == [
+        (
+            "get",
+            "tom-key",
+            {},
+            "/api/v1/sessions/sess-1/context",
+            None,
+        )
+    ]
+
+
 def test_openviking_commit_keeps_no_recent_live_messages():
     client = OpenVikingMemorySystemClient(store=FakeStore())
     calls = []