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…block (#36593) Introduces **`react-devtools-facade`**, a private, source-only package of building blocks for React runtime state introspection. Integrates with Reconciler through React DevTools global hook. ### Plan The facade is the shared, low-level layer that public, MCP-server–specific packages build on: - **`react-devtools-facade` (private)** — installs the React DevTools global hook and exposes a small, framework-agnostic API: install the hook, then assemble a set of tools from the returned handle. It installs *no* tool globals and makes no decision about how tools are surfaced. - **Integration packages (public)**, e.g. `react-devtools-cdt-mcp` — compose the facade's tools and target a specific MCP server (chrome-devtools-mcp first). This keeps all runtime-introspection logic in one reusable place while each integration owns its own protocol, packaging, serialisation and globals. ### This PR - `installFacade(target = globalThis): Facade` — installs **only** `__REACT_DEVTOOLS_GLOBAL_HOOK__` (the global React looks for at init) and returns a `Facade` handle `{hook, fiberRoots, rendererInternals, profilingState}`. The hook tracks fiber roots on commit and forwards commits to the profiling state when a session is active; building blocks read from the returned handle and never touch globals. - Guards against double-install (mixing with the full DevTools backend). *Temporary*, will later add compatibility for the RDT extension scenario. - Package scaffold: `package.json` (private, source-only), `index.js`, `README.md`. - Excluded from the general jest runners; runs under the build-devtools project, matching `react-devtools-shared` / `react-devtools-extensions`. > Tool building blocks and `createTools(facade)` land in the follow-ups.
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