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/store/store_test.go

@@ -377,4 +377,4 @@ func TestCalendarEvents(t *testing.T) {
 	if len(events) != 0 {
 		t.Fatalf("expected 0 events on July 8, got %d", len(events))
 	}
-}
+}