test(fixtures): add vite-kitchen fixture repo

Minimal Vite + React + TS + Tailwind app with a typed-props Button
component (the future react-docgen-typescript scan target), landed at
fixtures/ outside the pnpm workspace and turbo graph. Its dependencies
exist on paper only — the runner installs them after cloning (story 04);
no lockfile, never pnpm-installed here.

Ignore surfaces follow the docs/product/reference precedent: fallow,
root ESLint, prettier, and the coverage:diff ALLOWED_GLOBS all skip
fixtures/**.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016j8z4VHjedXDTjEDNg7qHK

eslint.config.js

@@ -29,6 +29,9 @@ export default [
       "playwright.config.ts",
       // Design reference material (ADR-029) — read-only prototypes, never linted
       "docs/product/reference/**",
+      // Test fixture repos — standalone apps outside the pnpm workspace and
+      // turbo graph, served to tests as git remotes; never linted
+      "fixtures/**",
     ],
   },
   js.configs.recommended,