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a1ede53fa9
Old values (open ±7, leave ±4) had matching EV but asymmetric variance; risk-averse parties had a strict preference to always leave gifts, which collapsed the dilemma. New values (all ±6) keep EV=0 for both strategies AND equalize variance. Choice now depends entirely on inferring sender intent. Adds TestCoopGiftVarianceSymmetric — fails loud if anyone reintroduces asymmetric magnitudes. EV test was already in place but only checked the mean; missed this on first pass. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>