Adds non-destructive test scenarios for the #187 boost-time fix and
the #175 / gacha-logging changes so regressions in those paths can be
caught without a full game client.
- boost: queries GET_BOOST_TIME_LIMIT, GET_BOOST_RIGHT, and
GET_KEEP_LOGIN_BOOST_STATUS, flagging a zero boost_limit and all-zero
login boost entries as the expected DisableBoostTime/DisableLoginBoost
state.
- gacha: snapshots GET_GACHA_POINT and RECEIVE_GACHA_ITEM (freeze=true,
so temp storage is not cleared), with an opt-in --roll flag that
exercises PLAY_NORMAL_GACHA end-to-end. Detects the post-#175
single-byte validation-failure ACK.
