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

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

packages/core-trpc/src/client.test.ts

@@ -1,12 +0,0 @@
-import { describe, it, expect } from "vitest";
-import { useTRPC, TRPCProvider } from "./client";
-
-describe("core-trpc client exports", () => {
-  it("exports useTRPC hook", () => {
-    expect(useTRPC).toBeTypeOf("function");
-  });
-
-  it("exports TRPCProvider component", () => {
-    expect(TRPCProvider).toBeTypeOf("function");
-  });
-});