fix migration 0013 missing statement-breakpoint markers

Drizzle's better-sqlite3 migrator splits SQL files on --> statement-breakpoint
before running each statement. Without it, multi-statement files fail with
"The supplied SQL string contains more than one statement".

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

drizzle/0013_issued_client_certificates.sql

@@ -12,5 +12,7 @@ CREATE TABLE `issued_client_certificates` (
   `created_at` text NOT NULL,
   `updated_at` text NOT NULL
 );
+--> statement-breakpoint
 CREATE INDEX `issued_client_certificates_ca_idx` ON `issued_client_certificates` (`ca_certificate_id`);
+--> statement-breakpoint
 CREATE INDEX `issued_client_certificates_revoked_at_idx` ON `issued_client_certificates` (`revoked_at`);