test(aihr): guard migration runbook coverage

scripts/tests/aihr-schema-migrations.test.sh

@@ -11,6 +11,14 @@ MYSQL_CONTAINER="wygj-mysql"
 DB="wygj_aihr_schema_test_$$"
 LEGACY_DB="wygj_aihr_candidate_legacy_test_$$"
 
+while IFS= read -r migration; do
+  migration_name="$(basename "$migration")"
+  grep -Fq "backend/script/sql/update/$migration_name" "$ROOT_DIR/docs/BRD_PRODUCTION_MIGRATION_RUNBOOK.md" || {
+    echo "FAIL: AIHR migration missing from production Runbook: $migration_name" >&2
+    exit 1
+  }
+done < <(find "$ROOT_DIR/backend/script/sql/update" -maxdepth 1 -type f -name 'aihr_*_mysql8.sql' -print | sort)
+
 mysql() {
   docker exec -i "$MYSQL_CONTAINER" mysql -uroot -proot --default-character-set=utf8mb4 "$@"
 }