fix(2meet-data-optimizer): drop cached routed counts when the migration engine rebuilds post rows

- migrate_entity (drift-check --fix), migrate_group and migrate_group_batch
  write flat rows outside the Hook Bus: bump the routed count version
  (once per call / batch; not on dry runs; post rows only)
- dev36: a vendor search kept counting 21515 of 21522 matches after a fix
- Verify: composer test (704), test:integration (598), phpcs, stan
- PR: PR-129

includes/engine/class-tmdo-entity-migration-engine.php

@@ -176,6 +176,9 @@ final class TMDO_Entity_Migration_Engine {
 		// 標記完成
 		if ( ! $options['dry_run'] ) {
 			self::mark_migration_completed( $entity_type, $group_name );
+			if ( $stats['migrated'] > 0 ) {
+				self::counts_changed( $entity_type );
+			}
 		}
 
 		$stats['elapsed_sec'] = round( microtime( true ) - $start_time, 2 );
@@ -183,6 +186,19 @@ final class TMDO_Entity_Migration_Engine {
 		return $stats;
 	}
 
+	/**
+	 * Rows rebuilt outside the Hook Bus (backfill, drift-check --fix): routed
+	 * post counts cached for the old rows are stale (2.4 PR-129).
+	 *
+	 * @param string $entity_type Entity type.
+	 * @return void
+	 */
+	private static function counts_changed( string $entity_type ): void {
+		if ( 'post' === $entity_type && class_exists( 'TMDO_Post_Query_Router' ) ) {
+			TMDO_Post_Query_Router::bump_count_version();
+		}
+	}
+
 	/**
 	 * Rebuild one entity's row of a group from native meta.
 	 *
@@ -194,7 +210,7 @@ final class TMDO_Entity_Migration_Engine {
 		if ( ! $adapter || empty( $group_fields ) ) {
 			return false;
 		}
-		return self::migrate_single_entity(
+		$migrated = self::migrate_single_entity(
 			$entity_type,
 			$group_name,
 			$entity_id,
@@ -203,6 +219,10 @@ final class TMDO_Entity_Migration_Engine {
 			$adapter,
 			false
 		);
+		if ( $migrated ) {
+			self::counts_changed( $entity_type );
+		}
+		return $migrated;
 	}
 
 	/**
@@ -409,6 +429,9 @@ final class TMDO_Entity_Migration_Engine {
 
 		$total = $prev_total + $batch_migrated;
 		$done  = count( $entity_ids ) < $batch_size;
+		if ( $batch_migrated > 0 ) {
+			self::counts_changed( $entity_type );
+		}
 
 		if ( $done ) {
 			self::mark_migration_completed( $entity_type, $group_name );