style: move JSDoc comment after all imports in run-tests-v20.js

Per review feedback, moved the JSDoc module documentation to come after
all import statements. Note: kept import ordering per project's
perfectionist ESLint config (alphabetical), not the Node.js builtin-first
convention suggested by the reviewer.

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

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

Author: boneskull

scripts/run-tests-v20.js

@@ -1,13 +1,14 @@
 #!/usr/bin/env node
 import { globSync } from 'glob';
+import { execFileSync } from 'node:child_process';
+
 /**
  * Test runner for Node.js v20
  *
  * Node.js v20's `node --test` command doesn't support glob patterns. This
  * script uses the `glob` package to find test files and passes them to `node
  * --test`.
  */
-import { execFileSync } from 'node:child_process';
 
 const pattern = process.argv[2] || 'test/**/*.test.ts';
 const files = globSync(pattern);