fix(core-eslint): activate React rules-of-hooks for all TSX surfaces

next.js and react-internal.js are plain re-exports of base, so no
rules-of-hooks checking was active anywhere despite three React apps
and core-ui. Wire eslint-plugin-react-hooks in base.js scoped to
**/*.tsx (non-React packages untouched). Fixes the one violation it
surfaced: web-tanstack's root route called Route.useLoaderData inside
an anonymous component callback — extracted to a named RootComponent.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

packages/core-eslint/base.js

@@ -3,6 +3,7 @@ import eslintConfigPrettier from "eslint-config-prettier";
 import tseslint from "typescript-eslint";
 import turboPlugin from "eslint-plugin-turbo";
 import boundaries from "eslint-plugin-boundaries";
+import reactHooks from "eslint-plugin-react-hooks";
 import globals from "globals";
 import conformancePlugin from "./plugin.js";
 import path from "node:path";
@@ -195,6 +196,13 @@ export default [
       "no-restricted-imports": "off",
     },
   },
+  // React rules-of-hooks for every TSX surface (apps, core-ui, feature
+  // ui/**). Scoped to .tsx so non-React packages are untouched.
+  {
+    files: ["**/*.tsx"],
+    plugins: { "react-hooks": reactHooks },
+    rules: reactHooks.configs.recommended.rules,
+  },
   // E1 — Event handlers must not be re-exported. Wire them only inside the
   // consumer feature's bind-production / bind-dev-seed (spec § 2.2 Rule E1).
   // J  — Direct `payload.jobs.*` access is forbidden outside the integration

packages/core-eslint/package.json

@@ -19,6 +19,7 @@
     "eslint": "^9.20.0",
     "eslint-config-prettier": "^10.1.0",
     "eslint-plugin-boundaries": "^4.2.2",
+    "eslint-plugin-react-hooks": "^5.2.0",
     "eslint-plugin-turbo": "^2.4.0",
     "typescript-eslint": "^8.25.0",
     "vitest": "^3.1.0"