Add memory system session context API

tests/test_memory_system_service.py

@@ -1,6 +1,6 @@
 import asyncio
 
-from memory_system_api.schemas import MessageIngestRequest, SearchRequest
+from memory_system_api.schemas import MessageIngestRequest, SearchRequest, SessionContextRequest
 from memory_system_api.service import MemorySystemService
 
 
@@ -44,6 +44,19 @@ class FakeOpenViking:
         await asyncio.sleep(0.01)
         return {"items": [{"source": "openviking-search"}]}
 
+    async def get_session_context(self, user_key: str, session_id: str) -> dict:
+        self.calls.append(("get_session_context", user_key, session_id))
+        return {
+            "status": "ok",
+            "result": {
+                "latest_archive_overview": "# Working Memory\nUser likes coffee.",
+                "pre_archive_abstracts": [],
+                "messages": [],
+                "estimatedTokens": 42,
+                "stats": {"totalArchives": 1},
+            },
+        }
+
     async def commit_session(self, user_key: str, session_id: str) -> dict:
         self.calls.append(("commit_session", user_key, session_id))
         return {"status": "ok", "result": {"task_id": "task-1", "archive_uri": "archive-1"}}
@@ -203,6 +216,43 @@ def test_search_returns_compact_items_and_backend_diagnostics_without_duplicate_
     assert not _has_key(response.backends["everos"].result, "original_data")
 
 
+def test_session_context_combines_openviking_context_and_everos_search_items():
+    openviking = FakeOpenViking()
+    everos = FakeEverOSVerbose()
+    service = MemorySystemService(openviking=openviking, everos=everos)
+
+    response = asyncio.run(
+        service.get_session_context(
+            "sess-1",
+            SessionContextRequest(user_id="tom", user_key="tom-key", query="我喜欢喝什么？", limit=5),
+        )
+    )
+
+    assert response.status == "success"
+    assert response.context == {
+        "latest_archive_overview": "# Working Memory\nUser likes coffee.",
+        "pre_archive_abstracts": [],
+        "messages": [],
+        "estimatedTokens": 42,
+        "stats": {"totalArchives": 1},
+    }
+    assert response.items == [
+        {
+            "source_backend": "everos",
+            "memory_type": "episode",
+            "id": "episode-1",
+            "user_id": "tom",
+            "session_id": "sess-1",
+            "timestamp": "2026-05-22T07:50:51.750000Z",
+            "summary": "userB 在对话中表示自己喜欢拿铁。",
+            "score": 0.72,
+        }
+    ]
+    assert ("credential_for_user", "tom", "tom-key", "sess-1") in openviking.calls
+    assert ("get_session_context", "key-tom", "sess-1") in openviking.calls
+    assert ("search", "tom", "sess-1", "我喜欢喝什么？", "hybrid", 5) in everos.calls
+
+
 def _has_key(value, key: str) -> bool:
     if isinstance(value, dict):
         return key in value or any(_has_key(item, key) for item in value.values())