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Adds `container-type: size` to every composition root element at runtime init, enabling `cqw`/`cqh` units in composition CSS. This is the foundation for aspect-ratio-independent compositions — content sized with container-relative units reflows naturally when dimensions change, eliminating the layout breakage seen when switching between 16:9, 9:16, 1:1, etc. Also adds a "Responsive Sizing" section to the composition patterns skill with examples of `cqw`/`cqh` usage for typography, positioning, and GSAP animations. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>