feat(generators): wire trpc entry + e2e test

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

turbo/generators/config.ts

@@ -642,6 +642,18 @@ import noRealtimeHandlerReexport from "./rules/no-realtime-handler-reexport.js";
         },
         printEventsNextSteps,
       ],
+      trpc: () => [
+        () => {
+          assertOptionalPackageNotPresent("core-trpc");
+          return "Guard passed — packages/core-trpc does not exist yet.";
+        },
+        ...emitTemplateTree("core-package/trpc", "packages/core-trpc"),
+        () => {
+          addToTranspilePackages("apps/web-next/next.config.mjs", "@repo/core-trpc");
+          return "Added @repo/core-trpc to transpilePackages.";
+        },
+        printTrpcNextSteps,
+      ],
     };
 
   plop.setGenerator("core-package", {
@@ -651,7 +663,7 @@ import noRealtimeHandlerReexport from "./rules/no-realtime-handler-reexport.js";
         type: "list",
         name: "name",
         message: "Which optional core package?",
-        choices: ["realtime", "events"],
+        choices: ["realtime", "events", "trpc"],
       },
     ],
     actions: (answers) => {
@@ -1146,6 +1158,35 @@ function printHandlerNextSteps(a: {
   ].join("\n");
 }
 
+function printTrpcNextSteps(): string {
+  return [
+    "─────────────────────────────────────────────────────────────",
+    "@repo/core-trpc scaffolded.",
+    "",
+    "Next steps (manual wiring — not generated):",
+    "",
+    "  1. pnpm install   # link the new workspace package",
+    "",
+    "  2. apps/web-next/src/app/providers.tsx:",
+    '     - import { NextTrpcProvider } from "@repo/core-trpc/next";',
+    "     - wrap children: <NextTrpcProvider trpcUrl=\"/api/trpc\">{children}</NextTrpcProvider>",
+    "",
+    "  3. apps/web-next/src/app/api/trpc/[trpc]/route.ts:",
+    '     - import { fetchRequestHandler } from "@trpc/server/adapters/fetch";',
+    '     - import { appRouter } from "@repo/core-api";',
+    "     - export GET and POST handlers using fetchRequestHandler",
+    "",
+    "  4. apps/web-tanstack/src/routes/__root.tsx:",
+    '     - import { TanstackTrpcProvider } from "@repo/core-trpc/tanstack";',
+    "     - wrap <Outlet /> with <TanstackTrpcProvider trpcUrl=\"http://localhost:3000/api/trpc\">",
+    "",
+    "  5. Add @repo/core-trpc to apps/web-next/package.json and apps/web-tanstack/package.json dependencies",
+    "",
+    "  6. pnpm typecheck && pnpm lint && pnpm test",
+    "─────────────────────────────────────────────────────────────",
+  ].join("\n");
+}
+
 function printEventsNextSteps(): string {
   return [
     "─────────────────────────────────────────────────────────────",