docs(mcp): note --no-close for node_console websocat usage

A heredoc (<<<) closes stdin at once, so websocat dropped the WebSocket
before the device's reply arrived. Add --no-close to the node_console usage
examples and the returned command field so the connection stays open while
output is read.

gns3server/api/routes/mcp/__init__.py

@@ -571,16 +571,18 @@ async def node_console(
     Complete workflow:
       1. Call this tool with project_id and node_id to get the WebSocket URL
       2. Connect to the returned URL using websocat in text mode (-t):
-         > websocat -t "ws://<your-gns3-server-host>:3080/v3/projects/{project_id}/nodes/{node_id}/console/ws?token={jwt_token}"
+         > websocat -t --no-close "ws://<your-gns3-server-host>:3080/v3/projects/{project_id}/nodes/{node_id}/console/ws?token={jwt_token}"
       3. Send device commands with \\r\\n line endings via heredoc:
-         > websocat -t "ws://..." <<< $'\\r\\nenable\\r\\nshow version\\r\\nexit\\r\\n'
+         > websocat -t --no-close "ws://..." <<< $'\\r\\nenable\\r\\nshow version\\r\\nexit\\r\\n'
       4. Receive response: websocat receives and displays device output
          Use 'timeout' to avoid connection hanging:
-         > timeout 10 websocat -t "ws://..." <<< $'commands\\r\\n'
+         > timeout 10 websocat -t --no-close "ws://..." <<< $'commands\\r\\n'
 
     Key points:
       - Use \\r\\n (not \\n) to match console protocol line endings
       - Use $'...' format for escape sequences in bash
+      - --no-close keeps the WebSocket open after stdin (heredoc) hits EOF, so
+        device output is not cut off before it arrives
       - Set a timeout to prevent hanging connections
     """
     return await asyncio.to_thread(_run_handler_sync, get_node_console_info_handler, {

gns3server/api/routes/mcp/nodes.py

@@ -328,7 +328,7 @@ def get_node_console_info_handler(params: dict[str, Any], gns3_ctx: dict[str, An
         "node_name": node.get("name"),
         "console_type": console_type,
         "ws_url": ws_url,
-        "command": f"websocat {ws_url}",
+        "command": f"websocat -t --no-close {ws_url}",
     }
     if console_type in ("vnc",):
         result["vnc_url"] = f"/v3/projects/{project_id}/nodes/{node_id}/console/vnc?token={gns3_ctx['jwt_token']}"