The translation middleware throws InvalidOperationException when an
action has no body parameters and a Unity client sends an encrypted
msgpack body. Tests pass without it because they post JSON directly
and bypass the middleware (no UnityPlayer User-Agent).
See RankBattleController.ForceFinish for the documented convention.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
/replay/info reads from ReplayHistoryReader, newest-first, capped at 50.
/replay/detail returns 400 with result_code=99 - local cache is the
canonical playback source so this endpoint is cache-miss fallback only.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>