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Adds critical constraints discovered from eval analysis of 27 agent-generated compositions: - Ban `repeat: -1` (broke loading-spinner, prompt 20) - Ban async timeline construction (broke particle-logo, prompt 16) - Enforce minimum font sizes: 16px data labels, 20px body text (prompts 7, 8, 13, 14, 15, 19 all had illegible small text) - Ban full-screen dark linear gradients (prompts 3, 5, 10, 14 all showed H.264 color banding) - Mandate `<link>` font loading over CSS `@import` (prompts 7, 24 had font loading races) - Updated output checklist with all new constraints Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>