fix lint issues

Signed-off-by: Grant Linville <[email protected]>

Author: g-linville

pkg/builtin/builtin.go

@@ -648,7 +648,7 @@ func SysDownload(ctx context.Context, env []string, input string) (_ string, err
 }
 
 func SysPrompt(ctx context.Context, _ []string, input string) (_ string, err error) {
-	monitor := ctx.Value("monitor")
+	monitor := ctx.Value(runner.MonitorKey{})
 	if monitor == nil {
 		return "", errors.New("no monitor in context")
 	}

pkg/runner/runner.go

@@ -26,6 +26,8 @@ type Monitor interface {
 	Stop(output string, err error)
 }
 
+type MonitorKey struct{}
+
 type Options struct {
 	MonitorFactory MonitorFactory        `usage:"-"`
 	RuntimeManager engine.RuntimeManager `usage:"-"`
@@ -150,7 +152,7 @@ func (r *Runner) call(callCtx engine.Context, monitor Monitor, env []string, inp
 
 	// The sys.prompt tool is a special case where we need to pass the monitor to the builtin function.
 	if callCtx.Tool.BuiltinFunc != nil && callCtx.Tool.ID == "sys.prompt" {
-		callCtx.Ctx = context.WithValue(callCtx.Ctx, "monitor", monitor)
+		callCtx.Ctx = context.WithValue(callCtx.Ctx, MonitorKey{}, monitor)
 	}
 
 	result, err := e.Start(callCtx, input)