Use before adding or changing a plugin's stage fields or options, such as read middleware, contributions, transfer vetoes or landing policy, and for a feature that spans Plite, Plate, the registry and docs. Load it before any edit to a Base plugin file under packages/platejs/src, such as packages/platejs/src/features/*/lib/Base*Plugin.ts, even when the task reads as Plite core, editor behavior or a bug fix. Builds Plate plugins and entrypoints with semantic ownership, inference, scoped capabilities and package proof, and delivers a feature across its package, UI, docs and release. Use it also when a change touches a plugin's Markdown or HTML encode or decode mapping or its preserve claims.