test(evals): only run eval sources, not their built copies (#1408)

The build compiles evals into `dist/`, which the vitest include glob
also matched, so every eval ran twice locally and in CI. This scopes the
glob to `src/`.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

Author: JoshuaKGoldberg

packages/mcp-server-evals/vitest.config.ts

@@ -3,7 +3,7 @@ import { defineConfig } from "vitest/config";
 
 export default defineConfig({
   test: {
-    include: ["**/*.eval.{js,mjs,cjs,ts,mts,cts,jsx,tsx}"],
+    include: ["src/**/*.eval.{js,mjs,cjs,ts,mts,cts,jsx,tsx}"],
     reporters: ["vitest-evals/reporter"],
     coverage: {
       provider: "v8",