feat(core-eslint): anchor for events rules splice

Add // <gen:events-rules> anchor to base.js near the E1 + J
no-restricted-syntax blocks, and assert it in anchors.test.js.
After core-events removal the anchor remains as the splice point
for pnpm turbo gen core-package events.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/core-eslint/base.js

@@ -108,6 +108,9 @@ export default [
   // consumer feature's bind-production / bind-dev-seed (spec § 2.2 Rule E1).
   // J  — Direct `payload.jobs.*` access is forbidden outside the integration
   // layer. Use IJobQueue (from @repo/core-shared/jobs) instead.
+  // Events + jobs rules are added here when @repo/core-events is scaffolded
+  // via `pnpm turbo gen core-package events`.
+  // <gen:events-rules>
   {
     files: ["**/*.{ts,tsx,mjs,cjs,js}"],
     rules: {