Artifact–Host Integration

Wire the contract between a portable HTML artifact and the editing/preview shell ("host") that runs it. The artifact stays a plain HTML document; the host wraps it in an iframe with editing chrome; the two talk over postMessage, and edits persist by the host rewriting marked regions of the source on disk. Provenance lives in skill.json; this file is runtime routing only.

Produces: the integration code/markup for one or more host contracts (tweak panel, fixed-canvas scaling, speaker notes, comment/scene anchors, direct-edit markup, bundling/export) plus an integration-checklist.md recording what was wired and what was deliberately left out.

Core principle