Build 25117558

Sollervir caf8e97 — Sealed Gate door HP now scales exactly +15% per chapter (was uneven due to ramp/mercy curve interaction); mob-overflow death-count is now a 10s grace timer that fully restores once enemy count drops back under the threshold, instead of permanently decrementing; treasure chest costs changed to 50/250/500 gold (was 100/500/2000) with odds Basic 45% / Intermediate 40% / Advanced 35%; treasure chest jackpot payouts were reworked twice and finally rebalanced so all three tiers share roughly the same expected-value-to-cost ratio (~0.9x) instead of Basic being disproportionately profitable (was ~2.6x EV). 218/218 tests, clean release-check.