Fix: remove strict_types declaration illegal under wp eval-file

wp eval-file evals the script body, so declare(strict_types=1) is never the
first statement and PHP fatals. Matches the readiness-report.php convention.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: JJJ

bin/generate-schemas.php

@@ -17,7 +17,8 @@
  * @package WcCoreTables
  */
 
-declare( strict_types = 1 );
+// No declare(strict_types) here: wp eval-file evals this file, where a strict_types
+// declaration cannot be the first statement of the script.
 
 use WcCoreTables\Generator\SchemaGenerator;