Report update progress and log to Hammerhead while updating

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

cmd/bamboo/main.go

@@ -55,7 +55,11 @@ func main() {
 	}
 	b, err := bamboo.New(bamboo.Config{Hammerhead: strings.TrimRight(*hh, "/"), Token: *token, DataDir: *data, Docker: *dockerOn,
 		Version: version, AutoUpdate: *autoUpdate,
-		UpdateNow: func(ctx context.Context) (string, error) { return selfupdate.CheckOnce(ctx, upd) }})
+		UpdateNow: func(ctx context.Context, progress func(string, int, string)) (string, error) {
+			c := upd
+			c.Progress = func(e selfupdate.Event) { progress(e.Stage, e.Pct, e.Line) }
+			return selfupdate.CheckOnce(ctx, c)
+		}})
 	if err != nil {
 		log.Fatal(err)
 	}