print experimental notice to stderr

Author: burmudar

cmd/src/mcp.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"flag"
 	"fmt"
+	"os"
 	"strings"
 
 	"github.com/sourcegraph/src-cli/internal/api"
@@ -22,7 +23,7 @@ func init() {
 	})
 }
 func mcpMain(args []string) error {
-	fmt.Println("NOTE: This command is still experimental")
+	fmt.Fprintln(os.Stderr, "NOTE: This command is still experimental")
 	apiClient := cfg.apiClient(nil, mcpFlagSet.Output())
 
 	ctx := context.Background()