Drive a node-native battle to seat B's turn, then ingest an opponent
PlayActions reveal frame (knownList[{idx,cardId,to:Field}], isPlayerSeat:false)
matching battle_test_cl2's wire shape. The engine's ReplaceReceivedCard.ReplaceCard
-> CreateActualCard -> CreateBattleCardWithGameObject path resolves headless and
seats the substituted card on seat B's board with the wire cardId. No Engine/ logic
edits and no new view shims were needed — the card-creation view surface is fully
covered by the BackGround/icon-anim/play-queue/hand stubs from Tasks 2/3.
Adds InPlayCardId(seat, boardPos) accessor (SessionBattleEngine + harness) to read a
seated in-play follower's true identity, leader-excluded like BoardCount.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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