(new): support Bot API 10.3

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

msg_context_test.go

@@ -9,8 +9,8 @@ import (
 	"strings"
 	"testing"
 
-	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
-	"git.scuroneko.dev/scuroneko/laniakea/tgrich"
+	"git.scuroneko.dev/scuroneko/laniakea/v2/tgapi"
+	"git.scuroneko.dev/scuroneko/laniakea/v2/tgrich"
 	"git.scuroneko.dev/scuroneko/sneklog/v2"
 )
 
@@ -442,7 +442,11 @@ func TestNewInlineKeyboardButtonUsesContextPayloadType(t *testing.T) {
 	kb := NewInlineKeyboardJSON(1).
 		AddButton(ctx.NewInlineKeyboardButton("A").SetCallbackData("cmd", 1, "two"))
 
-	got, _, err := decodePayload(BotPayloadJSON, kb.Get().InlineKeyboard[0][0].CallbackData, false)
+	markup, err := kb.Get()
+	if err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
+	got, _, err := decodePayload(BotPayloadJSON, markup.InlineKeyboard[0][0].CallbackData, false)
 	if err != nil {
 		t.Fatalf("decodePayload returned error: %v", err)
 	}