relief_grad across the cold ladder: Global 0.00, Region 1.08, District 0.30, Quarter 0.07. Closure note records the two premises the ticket got wrong (Nyquist is the aliasing limit, not a legibility one) and the coast-warp trade taken at Region, with its reversal path. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>