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Brainstormed design for a lightweight booster economy (hammer/shuffle/ line-bomb) earned via a 7-day login calendar and rewarded ads, used in a stage via a booster bar. Boosters mutate the grid only — no move cost, no score/combo, no objective credit — so stage balance is preserved while they can rescue a dead board. Approved by owner; next: impl plan. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>