ai-sherpa/nash-playerwise-concave-coupling-constraints-repro

Claim 5 rework: widened eps sweep (714x range, 2040 runs) -> VERIFIED; paired exponent diff +0.578 [0.526,0.630], +0.921 [0.793,1.049] in boundary-active regime

Update logbook: Repro — Nash Equilibria in Games with Playerwise Concave Coupling Constraints

initial commit