Constellation, manuscript, groove and tapestry now use the embed runtime (resize: size, eager mount, ctx.animate, ctx.colors, ctx.describe, labelColor for caption text) instead of their own bootstrap, observers and D3 loader. The hero box no longer forces an aspect ratio: the banner root sets it, as the banners skill and check:embed expect. The /banners gallery loads the runtime and shows the default banner too.
chore: import local WIP (embed runtime, check:embed, skills)
Imported from the uncommitted work of the main tree: Embed.mount runtime (public/scripts/embed-runtime.js), check:embed script, embeds migrated to the runtime, write-mdx-content and design-dataviz skills, create-html-embed skill rewrite, agent docs. The old TableOfContents.astro tweak is dropped since the component was replaced.
