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The headless engine accumulates spell-charge for real on the receive path (each spell play runs the played card's own AddSpellChargeCount) and resolves the discounted cost by construction, so the wire-derived spellboost-count bookkeeping is redundant. Engine-source the knownList spellboost COUNT too (prod-faithful) via a new SessionBattleEngine.PlayedCardSpellboost, using the same persist-post-play zone search as PlayedCardCost (SpellChargeCount survives PlayCard; only ctor/ReturnCard zero it). - Delete IdxToSpellboost/SpellboostMap/GetSpellboostMap/RecordSpellboostFrom (BattleSessionState) and MineAlterSpellboosts (KnownListBuilder); token/choice/ copy identity maps are untouched. - BuildPlayedCard takes an engine-sourced spellboost int (drops spellboostMap). - Seed BattleLogManager fusion lists headless (the per-frame filter cleanup NREs on null EnemyFusionCard when a fanfare card registers a CalledCreateFilter) so real spell-charge grantor plays resolve. - Add committed real-charge regression tests (no SeedHandCardSpellboostCost seam): one grantor play accumulates +1 on the reducer -> cost 5->4, count 1, persisting post-play; handler emits cost 4 + spellboost 1 engine-sourced. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>