Use when building a SolidJS app in a touchstone repo — signals/stores, props, control flow, resources, context, SolidStart SSR/routing/server functions. Triggers on `solid-js`/`@solidjs/start` in package.json, .tsx using Solid (createSignal/createStore), app.config.ts, src/routes. Language-level TS rules live in the typescript skill; for React (VDOM, hooks, re-render) use the react skill.
