Adds SessionBattleEngine.PlayedCardSpellboost + PeekPlayedCardSpellboost (pre-resolve
read of the acting seat's hand card by Index==playIdx) and a CaptureReplay.InterleavedSends
helper. The non-circular capture oracle (engine-derived spellboost vs prod's independent
emission to cl2: idx2->1, idx14->2) is added but [Ignore]'d: the headless receive path does
not apply the wire's authoritative orderList (Deal/Swap don't seat the mulligan hand, draws
follow the seeded deck top instead of the wire move ops, plays never remove the card, alter
spellboost never accumulates), so the engine cannot yet DERIVE the count. Closing this needs
an Engine/*.cs + VfxMgr-execution logic change (escalation per the N2 playbook), not a
mechanical no-op fill. Read surface, node + engine builds, drift, and the rest of the
SessionEngine suite are green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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