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>

apps/web-next/src/__tests__/sign-up-welcome-email.test.ts

@@ -1,8 +1,16 @@
-// Cross-feature proof-of-life: signing up in @repo/auth publishes
-// userSignedUpEvent on the shared bus, marketing-pages' subscriber enqueues
-// a send-welcome-email job on the shared queue, and dev-seed's
-// InMemoryJobQueue.register() dispatches it to the wrapped job — which
-// records the call on the bound RecordingMailerService.
+// Cross-feature event bus proof-of-life (DISABLED — @repo/core-events removed).
+//
+// @repo/core-events is now optional. When absent, ctx.bus is undefined, and
+// bus?.subscribe(...) / bus?.publish(...) calls are no-ops. Cross-feature event
+// fanout does not occur until core-events is scaffolded via:
+//
+//   pnpm turbo gen core-package events
+//
+// After scaffolding, restore this test and re-wire the bus in bind-production.ts
+// (see the comment in bindAll()). Until then, signing up does NOT trigger a
+// welcome email — the mailer queue stays empty.
+//
+// Replaced with a reduced test that asserts the no-bus behavior.
 
 import "reflect-metadata";
 import { describe, it, expect, beforeEach } from "vitest";
@@ -14,12 +22,12 @@ import { marketingPagesContainer } from "@repo/marketing-pages/di/container";
 import { MARKETING_PAGES_SYMBOLS } from "@repo/marketing-pages/di/symbols";
 import { RecordingMailerService } from "@repo/marketing-pages/services/recording-mailer";
 
-describe("e2e: sign-up triggers welcome email via cross-feature event", () => {
+describe("e2e: sign-up with no event bus (core-events not scaffolded)", () => {
   beforeEach(() => {
     __resetBindStateForTests();
   });
 
-  it("delivers a welcome email after a successful sign-up", async () => {
+  it("sign-up succeeds and mailer stays empty (no cross-feature fanout without bus)", async () => {
     await bindAllDevSeed();
 
     const mailer = marketingPagesContainer.get<RecordingMailerService>(
@@ -33,12 +41,10 @@ describe("e2e: sign-up triggers welcome email via cross-feature event", () => {
       confirmPassword: "secret_password",
     });
 
-    // The InMemoryJobQueue dispatches the registered handler on setImmediate;
-    // wait for microtasks + one setImmediate tick to settle.
+    // Without a bus, bus?.subscribe() is a no-op so the event handler never
+    // fires and the mailer receives nothing.
     await new Promise((r) => setImmediate(r));
 
-    expect(mailer.sent).toEqual([
-      { userId: expect.any(String), email: "testuser@example.local" },
-    ]);
+    expect(mailer.sent).toEqual([]);
   });
 });