Data and code archive for: Spectral structure of noise thresholds for contextuality: Walsh modes, a heralded-CHSH invariant, and model dependence

Certificates, checkers and data accompanying the preprint "Spectral structure of noise thresholds for contextuality: Walsh modes, a heralded-CHSH invariant, and model dependence" (I. Postanovsky, 2026): cone covers of RP^3 with per-leaf moment-LP certificates for the bit-flip and joint-reset noise models, the ball-arithmetic certificate of the expansion of the CH-branch constant kappa*_n, exact certificates over Q(sqrt5) for the counterexamples, and the data of all figures and tables. MANIFEST.txt gives the SHA-256 of every file.