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Adds a comprehensive font skill covering: - How the deterministic font compiler works (embedded database + aliases) - Full embedded font database reference table (11 families + aliases) - Step-by-step guide to download and add custom fonts via @font-face - Why Google Fonts @import fails in Docker and how to fix it - Safe default font recommendations by use case - CJK font handling (download woff2, single weight to manage size) - Emoji platform differences (macOS vs Docker/Linux) - Troubleshooting: unresolved fonts, tofu boxes, first-frame fallback - Sub-composition font loading (per-file @font-face, ../ paths) This teaches agents to always download fonts locally rather than relying on Google Fonts CDN, preventing the most common render failure in Docker/offline environments. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>