fix(2meet-data-optimizer): keep searches native while a group is known to drift

- The post query router routes no clause of a group whose last drift-check recorded miss / diff / extra; all or nothing, so such a query stays fully native. A group never checked keeps routing (decision 2026-09-27: no slowdown after upgrading; PR-073 samples daily).
- The check sits in route_clause(), which every routed clause, HivePress sort shape and meta_key sort goes through.
- Verify: PostQueryRouterDriftTest (drifting group and drifting sort key RED before); dev36 hp_listing price search in shadow_read: clean → flat, drift → native, unchecked → flat, found 90347 each.
- PR: PR-072

includes/query/class-tmdo-post-query-router.php

@@ -523,9 +523,23 @@ class TMDO_Post_Query_Router {
 		return false;
 	}
 
+	/**
+	 * The last `wp tmdo drift-check` found the group out of step with native
+	 * meta. A group never checked keeps routing.
+	 *
+	 * @param string $group Entity group name.
+	 * @return bool
+	 */
+	private static function drifting( string $group ): bool {
+		$status = get_option( TMDO_Drift_Check::OPTION, array() );
+		$last   = is_array( $status ) ? ( $status['post'][ $group ] ?? null ) : null;
+		return is_array( $last ) && (int) ( $last['miss'] ?? 0 ) + (int) ( $last['diff'] ?? 0 ) + (int) ( $last['extra'] ?? 0 ) > 0;
+	}
+
 	/**
 	 * The routed form of a clause, or null when the flat column would not
-	 * compare the way WordPress compares the meta_value string.
+	 * compare the way WordPress compares the meta_value string, or when the
+	 * group is known to drift from native meta.
 	 *
 	 * Native casts meta_value by the clause type (CHAR when absent); flat
 	 * columns are typed. Routed: EXISTS / NOT EXISTS; string columns with
@@ -560,7 +574,7 @@ class TMDO_Post_Query_Router {
 				&& in_array( $compare, array( '=', '!=', '<>', 'IN', 'NOT IN' ), true )
 				&& array() === array_filter( (array) $value, static fn( $v ) => ! is_scalar( $v ) || (string) (int) $v !== (string) $v );
 		}
-		if ( ! $ok ) {
+		if ( ! $ok || self::drifting( (string) $field['group'] ) ) {
 			return null;
 		}