Move crypto polyfill to vitest config entry point

- Create separate vitest-polyfill.mjs file
- Import polyfill at the very beginning of vitest.config.mjs
- Ensures polyfill is loaded before Vitest needs crypto.getRandomValues
- Fixes startup error in CI with Node 18

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: Matt-Dionis

claude-config-composer/vitest-polyfill.mjs

@@ -0,0 +1,11 @@
+// Polyfill for crypto.getRandomValues for Node < 19
+import crypto from 'crypto';
+
+if (!globalThis.crypto) {
+  globalThis.crypto = crypto;
+}
+if (!globalThis.crypto.getRandomValues) {
+  globalThis.crypto.getRandomValues = function(array) {
+    return crypto.randomFillSync(array);
+  };
+}

claude-config-composer/vitest.config.mjs

@@ -1,3 +1,4 @@
+import './vitest-polyfill.mjs';
 import path from 'path';
 import { defineConfig } from 'vitest/config';
 import { fileURLToPath } from 'url';