(new): support Bot API 10.3

(fix): finalize v2 contracts
(tests): cover v2 migration
(doc): prepare release guidance

bot_webhook_test.go

@@ -11,7 +11,7 @@ import (
 	"testing"
 	"time"
 
-	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
+	"git.scuroneko.dev/scuroneko/laniakea/v2/tgapi"
 	"git.scuroneko.dev/scuroneko/sneklog/v2"
 )
 
@@ -91,7 +91,7 @@ func TestRunWebhookRuntimeExecutesRunners(t *testing.T) {
 		updateQueue: make(chan *tgapi.Update, 1),
 		maxWorkers:  1,
 		runners: []Runner[NoData]{
-			NewRunner("runner", func(bot *Bot[NoData]) error {
+			NewRunner("runner", func(context.Context, *Bot[NoData]) error {
 				calls.Add(1)
 				return nil
 			}).Async(false),