Add an entry point for the completion tool

tools/cmd/main.go

@@ -9,6 +9,7 @@ import (
 
 	"kitty/tools/cli"
 	"kitty/tools/cmd/at"
+	"kitty/tools/completion"
 )
 
 func main() {
@@ -18,6 +19,8 @@ func main() {
 	})
 	root.AddCommand(at.EntryPoint(root))
 
+	root.AddCommand(completion.EntryPoint(root))
+
 	cli.Init(root)
 	if err := cli.Execute(root); err != nil {
 		cli.PrintError(err)