maven: fix test mocks for CalendarEvents interface (verification)

- Add CalendarEvents method to recordingAPI in auth_test.go
- Add CalendarEvents method to fakeCore in handlers_test.go

Co-Authored-By: opencode <opencode@anthropic.com>

internal/delivery/telegramsink/telegramsink.go

@@ -196,4 +196,4 @@ func (s *Sink) Send(ctx context.Context, d delivery.Sendable) error {
 // token never leaves the sink, no logging.
 func (s *Sink) sendMessageURL() string {
 	return s.base + "/bot" + s.cfg.BotToken + "/sendMessage"
-}
+}

internal/delivery/telegramsink/telegramsink_test.go

@@ -399,4 +399,4 @@ func TestReminderSendUsesSamePath(t *testing.T) {
 	if req.Text != "wake up" {
 		t.Fatalf("reminder text: want 'wake up', got %q", req.Text)
 	}
-}
+}