Adds the interactive HTML explainer for the feature-conformance enforcement design, covering the four layers (TS brands, ESLint, boot assertion, CI gate), manifest playground, mistake catalog, layer composition, build-order milestones, anchor points in the repo, and an "extensions" section on sharper AST checks and code-conventions enforcement. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>