plugin-guide-maintenance

# Maintain the Plugin Guide for a public API change The Plugin Guide is bb's public Plugin SDK reference. Use this workflow only when a public API change affects its documented contract. ## Confirm the trigger Build the declarations and inspect the SDK change: ```sh pnpm exec turbo run build:types --filter=@get-bb/plugin-sdk git diff -- packages/plugin-sdk/package.json packages/plugin-sdk/src ``` Continue only when the API change affects a Guide card, API symbol list, fixture, or SDK inventory. If the Guide remains accurate, do not change it. New public members also require: - an `experimental_` name, or an `Experimental` type name; - an entry in `docs/api_to_audit.md`; - compatibility with released SDK users unless the user approves the break. ## Find the product source For a visible method, inspect these sources: 1. The app component that shows the surface. 2. The slot, collector, or adapter that inserts the plugin content. 3. The closest app test that defines the real states. Record stable source paths and anchors in `packages/plugin-api-map/src/anatomy-manifest.json`. Use labels, roles, data attributes, class constants, and state names as anchors. For a method without a visible surface, use the Plugin backend group. Do not invent interface elements. ## Add the Guide entry For a new Guide entry, run the scaffold command with its sources and symbols: ```sh pnpm exec turbo run scaffold:surface-entry --filter=@bb/plugin-api-map -- \ --id <stable-id> \ --tit...