docs: rank the destructive generator as item 0

It was written up in 4.7 but never made the work order, which is exactly how it
stayed dangerous in the first place.

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

examples/inter-app-api-showcase/packages/shared/src/index.ts

@@ -0,0 +1,30 @@
+/**
+ * Shared code for every app in this workspace. Import it anywhere: `@app/shared`.
+ * The cross-app event bus uses Redis so messages reach every app process/domain.
+ */
+import { createPubSub } from "../../../../../packages/pubsub/src/index.ts";
+import { redisDriver } from "../../../../../packages/pubsub/src/redis.ts";
+import { defineService, procedure } from "../../../../../packages/rpc/src/index.ts";
+import { v } from "../../../../../packages/validation/src/index.ts";
+
+// One bus per process, backed by Redis (set REDIS_URL, defaults to localhost:6379).
+export const bus = createPubSub(redisDriver(process.env.REDIS_URL));
+
+// Shared domain types can live here and be imported by every app.
+export interface Tenant {
+  id: string;
+  name: string;
+}
+
+/** Contract shared by web (caller) and admin (callee). */
+export const catalogService = defineService({
+  name: "catalog",
+  procedures: {
+    getProduct: procedure
+      .input(v.object({ sku: v.string() }))
+      .output<{ sku: string; name: string; priceCents: number }>()
+      .permission("catalog:read")
+      .idempotent()
+      .build(),
+  },
+});