bayes for days

feat(scenarios)!: drop River Delta 1 from the map pool master

No water-free path joins its deployment edges, so a match on it could only ever reach the round limit at 100% BV a side. It is the only board of the twelve that fails the crossing check. The suite is regenerated without it and validates clean. EPOCH becomes 3: which maps are admissible is a rule about what a match is, so earlier numbers do not compare.