ollie-remote: wire streaming output to JSON-RPC notifications

ExecuteInSandbox uses StreamFunc(ctx) to emit partial output. The
context passed to it lacked a WithOutputStream callback, so no output
was ever streamed back to the client.

Fix: wrap ctx with WithOutputStream that encodes output as JSON-RPC
notifications (id=0, result={data:...}). The client side already
handles these via the outputNotification path in CallTool.

cmd/ollie-remote/main.go

@@ -122,6 +122,10 @@ type shellParams struct {
 	Stdin    string `json:"stdin,omitempty"`
 }
 
+type outputNotif struct {
+	Data string `json:"data"`
+}
+
 func serveRPC(ctx context.Context, srv *toolsrv.Server, in io.Reader, out io.Writer) {
 	dec := json.NewDecoder(in)
 	enc := json.NewEncoder(out)
@@ -151,7 +155,14 @@ func serveRPC(ctx context.Context, srv *toolsrv.Server, in io.Reader, out io.Wri
 				})
 				continue
 			}
-			result, err := srv.ExecuteInSandbox(ctx, params.Command, params.Language, params.Timeout, "default", false, params.Stdin, false)
+			// Wire streaming output to JSON-RPC notifications.
+			streamCtx := toolsrv.WithOutputStream(ctx, func(data string) {
+				enc.Encode(rpcResponse{
+					JSONRPC: "2.0",
+					Result:  outputNotif{Data: data},
+				})
+			})
+			result, err := srv.ExecuteInSandbox(streamCtx, params.Command, params.Language, params.Timeout, "default", false, params.Stdin, false)
 			if err != nil {
 				enc.Encode(rpcResponse{
 					JSONRPC: "2.0",