test(verify): resolve @objectstack/metadata to source in this package's tests

check:test-source-alias prescribes it: every verify test reaches the
metadata package through harness.ts, and the gate's registry is
shrink-only.

Claude-Session: https://claude.ai/code/session_01VoSxBQujKLZKPwK2u5ehQ6
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

packages/verify/vitest.config.ts

@@ -57,6 +57,7 @@ export default defineConfig({
   resolve: {
     alias: [
       { find: /^@objectstack\/core$/, replacement: path.resolve(HERE, '../core/src/index.ts') },
+      { find: /^@objectstack\/metadata$/, replacement: path.resolve(HERE, '../metadata/src/index.ts') },
     ],
   },
   test: {