refactor: remove core-events from main (scaffoldable via gen core-package events)

- Delete packages/core-events/ (15 files)
- Strip @repo/core-events from all 5 feature package.json + apps/web-next/package.json
- Strip @repo/core-events from apps/web-next/next.config.mjs transpilePackages
- Strip E1 + J no-restricted-syntax blocks from core-eslint/base.js (anchor remains)
- Update bind-production.ts: drop bus construction + IEventBus import; rename
  resolveEventsAndJobsProduction → resolveJobsProduction (queue only),
  resolveEventsAndJobsDevSeed → resolveJobsDevSeed (queue only);
  ctx no longer has bus field; BindProductionContext generic arg narrowed
- Update bind-production.test.ts: assert ctx.bus is undefined, drop
  PayloadJobsEventBus/InMemoryEventBus instanceof checks
- Update sign-up-welcome-email.test.ts: assert mailer stays empty without bus
- Inline userSignedUpEvent in auth (drop defineEvent import from core-events)
- Drop InMemoryEventBus fallback from auth/di/module.ts

Feature binders' bus?.subscribe/publish calls remain as no-ops. Scaffold
@repo/core-events back via: pnpm turbo gen core-package events

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

packages/auth/package.json

@@ -20,7 +20,6 @@
     "typecheck": "tsc --noEmit"
   },
   "dependencies": {
-    "@repo/core-events": "workspace:*",
     "@repo/core-shared": "workspace:*",
     "@trpc/server": "^11.0.0",
     "inversify": "^6.2.0",