ASI Clock: moved 711d closer (2026-04-15)

Methodology v1.4.0. ASI projection moved earlier (2033-11-26 → 2031-12-16). Three changes. (1) HLE→95% and FrontierMath→95% now use sigmoid extrapolation with weights raised 0.30 → 0.375 each. (2) Singularity+2yr weight reduced 0.40 → 0.25 so ASI does not inherit Singularity's inertia. (3) Cascade minimum buffer from Singularity to ASI widened from 365d to 730d (MIN_BUFFER_DAYS_SING_TO_ASI), reflecting that ASI (qualitatively beyond best human, all domains) is not a one-year hop past recursive-improvement onset. The new date is pinned by cascade (Singularity 2029-12 + 730d = 2031-12); benchmark signals independently project earlier (2028-08 and 2029-03).