fix(2meet-data-optimizer): skip zone deletes on tables that were never created

- TMDO_Zone_Router::delete_post() deleted from wp_wpdo_hot_/cold_{post_type}
  whenever fields were registered for that zone, so every post delete on a
  HivePress site (cold fields registered, module idle, table never created)
  logged a "table doesn't exist" error. Hot and cold deletes now also need
  the table to exist; module state is not checked, so a table left by a
  rolled-back module still loses the rows of deleted posts.
- Live suite zero_side_effect: saving / updating / deleting an hp_listing
  issues no query on missing zone tables (covers PR-054 and this PR).
- Verify: ZoneRouterTest 22 OK; live zero_side_effect + shadow_write +
  serialized 9/9 PASS (old code: zero_side_effect FAIL); unit 687 OK,
  integration 484 OK, phpcs (phpcs.xml) 0, stan OK
- PR: PR-054b

tests/live/README.md

@@ -38,6 +38,7 @@ Exit code 0 when every test passed, 1 otherwise. Output per test:
 |---|---|
 | `shadow_write` | writes in shadow_read reach native meta (user, term, HivePress listing) |
 | `serialized` | array meta values are stored serialized in flat tables, never "Array" |
+| `zero_side_effect` | zone tables that were never created are never queried on save / delete |
 
 ## Tools (`tools/`)
 

tests/live/suites/zero_side_effect.php

@@ -0,0 +1,46 @@
+<?php
+/**
+ * Suite: zone tables that were never created are never queried.
+ *
+ * Bug (dev36, 2026-09-26): the HivePress AddOn registers cold fields, so every
+ * save_post / loop_start (PR-054) and every post delete (PR-054b) queried
+ * wp_wpdo_cold_{post_type} although the cold module was idle and the table
+ * did not exist ("table doesn't exist" DB errors on each write).
+ *
+ * @package WP_Data_Optimizer
+ */
+
+declare(strict_types=1);
+
+TMDO_Live::test(
+	'saving and deleting an hp_listing does not touch missing zone tables',
+	static function () {
+		global $wpdb;
+		$tables = array( TMDO_Zone_Cold::table( 'hp_listing' ), TMDO_Zone_Hot::table( 'hp_listing' ) );
+		foreach ( $tables as $table ) {
+			if ( TMDO_Schema_Manager::table_exists( $table ) ) {
+				throw new TMDO_Live_Skip( "{$table} exists on this site" );
+			}
+		}
+
+		$touched = array();
+		$spy     = static function ( $sql ) use ( $tables, &$touched ) {
+			foreach ( $tables as $table ) {
+				if ( false !== strpos( $sql, $table ) && 0 !== stripos( ltrim( $sql ), 'SHOW TABLES' ) ) {
+					$touched[] = $sql;
+				}
+			}
+			return $sql;
+		};
+		add_filter( 'query', $spy );
+		try {
+			$id = TMDO_Live_Fixtures::post( 'hp_listing' );
+			wp_update_post( array( 'ID' => $id, 'post_title' => 'tmdo-live-updated' ) );
+			wp_delete_post( $id, true );
+		} finally {
+			remove_filter( 'query', $spy );
+		}
+
+		tmdo_live_assert_same( array(), $touched, 'queries on missing zone tables' );
+	}
+);