Add memory management APIs for OpenViking: list, read, write, and delete memories

skills/memory-system-api/SKILL.md

@@ -61,6 +61,10 @@ Base path: `/memory-system`
 | `POST` | `/sessions/{session_id}/extract` | Trigger OpenViking extract only | Yes |
 | `GET/POST` | `/sessions/{session_id}/context` | Read OpenViking session context plus EverOS recall | Yes |
 | `GET` | `/openviking/tasks/{task_id}` | Poll OpenViking task status | Yes |
+| `GET` | `/memories` | List OpenViking memory URIs under a memory root | Yes |
+| `GET` | `/memories/content` | Read one OpenViking memory URI | Yes |
+| `POST` | `/memories` | Create, replace, or append an OpenViking memory via `content/write` | Yes |
+| `DELETE` | `/memories` | Delete an OpenViking memory URI via `fs` | Yes |
 | `POST` | `/search` | Search OpenViking and EverOS | Yes |
 | `GET` | `/users/{user_id}/profile` | Read EverOS profile | Yes |
 
@@ -147,6 +151,50 @@ GET with query parameters is also supported:
 curl -sS "$BASE/memory-system/sessions/sessionA1/context?user_id=userA&user_key=$USER_KEY&query=我喜欢喝什么？&limit=10"
 ```
 
+List memories:
+
+```bash
+curl -sS -G "$BASE/memory-system/memories" \
+  --data-urlencode "user_id=userA" \
+  --data-urlencode "user_key=$USER_KEY" \
+  --data-urlencode "uri=viking://user/memories" \
+  --data-urlencode "recursive=true"
+```
+
+Read memory:
+
+```bash
+curl -sS -G "$BASE/memory-system/memories/content" \
+  --data-urlencode "user_id=userA" \
+  --data-urlencode "user_key=$USER_KEY" \
+  --data-urlencode "uri=viking://user/memories/preferences/python.md"
+```
+
+Create, replace, or append memory:
+
+```bash
+curl -sS -X POST "$BASE/memory-system/memories" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "user_id": "userA",
+    "user_key": "'"$USER_KEY"'",
+    "uri": "viking://user/memories/preferences/python.md",
+    "content": "# Python 偏好\n\n用户偏好使用 Python 做数据分析。",
+    "mode": "replace",
+    "wait": true
+  }'
+```
+
+Delete memory:
+
+```bash
+curl -sS -X DELETE -G "$BASE/memory-system/memories" \
+  --data-urlencode "user_id=userA" \
+  --data-urlencode "user_key=$USER_KEY" \
+  --data-urlencode "uri=viking://user/memories/preferences/python.md" \
+  --data-urlencode "recursive=false"
+```
+
 ## Response Handling
 
 Top-level `status` is one of: