为 OpenViking 内存命中添加最新内容读取功能，并更新相关文档和测试用例

tests/test_memory_system_service.py

@@ -488,6 +488,59 @@ def test_search_returns_compact_items_and_backend_diagnostics_without_duplicate_
     assert not _has_key(response.backends["everos"].result, "original_data")
 
 
+def test_search_includes_latest_openviking_memory_content_for_memory_hits():
+    class FakeOpenVikingWithStaleSearch(FakeOpenViking):
+        async def search(
+            self,
+            user_key: str,
+            query: str,
+            limit: int,
+            level: int = 2,
+            score_threshold: float = 0.8,
+            target_uri: str = "viking://user/memories",
+        ) -> dict:
+            self.calls.append(("search", user_key, query, limit, level, score_threshold, target_uri))
+            return {
+                "status": "ok",
+                "result": {
+                    "memories": [
+                        {
+                            "context_type": "memory",
+                            "uri": "viking://user/tom/memories/preferences/drink.md",
+                            "level": 2,
+                            "score": 0.91,
+                            "abstract": "用户喜欢拿铁咖啡。",
+                        }
+                    ],
+                    "resources": [],
+                    "skills": [],
+                    "total": 1,
+                },
+            }
+
+        async def read_memory(self, user_key: str, uri: str) -> dict:
+            self.calls.append(("read_memory", user_key, uri))
+            return {"status": "ok", "result": {"uri": uri, "content": "用户不喜欢咖啡，只喜欢下午喝奶茶"}}
+
+    openviking = FakeOpenVikingWithStaleSearch()
+    service = MemorySystemService(openviking=openviking, everos=FakeEverOS())
+
+    response = asyncio.run(service.search(
+        SearchRequest(user_id="tom", user_key="tom-key", session_id="sess-1", query="我喜欢喝什么？", limit=5),
+    ))
+
+    assert response.items[0] == {
+        "source_backend": "openviking",
+        "context_type": "memory",
+        "uri": "viking://user/tom/memories/preferences/drink.md",
+        "level": 2,
+        "score": 0.91,
+        "abstract": "用户喜欢拿铁咖啡。",
+        "content": "用户不喜欢咖啡，只喜欢下午喝奶茶",
+    }
+    assert ("read_memory", "key-tom", "viking://user/tom/memories/preferences/drink.md") in openviking.calls
+
+
 def test_session_context_combines_openviking_context_and_everos_search_items():
     openviking = FakeOpenViking()
     everos = FakeEverOSVerbose()