fix(2meet-data-optimizer): refuse aeav_only and cleanup on HivePress / WooCommerce sites

- Add TMDO_Promotion_Guard: HivePress models read every meta key with an
  empty-key get_*_meta() and WooCommerce does the same for products (and
  writes stock/sales with direct SQL), so on those sites native meta must
  stay authoritative. Promotion to aeav_only is refused in
  TMDO_Mode_Manager::set() (covers REST, CLI, phases, auto-promoter) for
  post/user/term/comment with HivePress and post/user with WooCommerce;
  TMDO_Post_Migration::cleanup() and the cleanup phase refuse too.
  Demotion stays open; filter tmdo_promotion_guard_allow overrides.
- Admin notice lists guarded entities already in aeav_only with the
  restore-native command (no forced demotion on read).
- Verify: PromotionGuardTest 8 OK; unit 668 OK, integration 480 OK,
  phpcs (phpcs.xml) 0, stan OK; dev36 live: 4 promotions + post-cleanup
  refused, wpdo_bridge_modes unchanged
- PR: PR-053

2meet-data-optimizer.php

@@ -234,6 +234,7 @@ require_once TMDO_PATH . 'includes/class-tmdo-rest-api.php';
 // ── v2.0.0 Engine + Adapters + Modules ───────────────────────────────────
 require_once TMDO_PATH . 'includes/engine/class-tmdo-type-caster.php';
 require_once TMDO_PATH . 'includes/engine/class-tmdo-mode-manager.php';
+require_once TMDO_PATH . 'includes/engine/class-tmdo-promotion-guard.php';
 require_once TMDO_PATH . 'includes/engine/class-tmdo-audit-logger.php';
 require_once TMDO_PATH . 'includes/engine/class-tmdo-shadow-diff-logger.php';
 require_once TMDO_PATH . 'includes/engine/class-tmdo-conflict-detector.php';
@@ -292,6 +293,8 @@ if ( is_admin() ) {
 	TMDO_Deprecated_Addons_Notice::register();
 	require_once TMDO_PATH . 'admin/class-tmdo-missing-addons-notice.php';
 	TMDO_Missing_Addons_Notice::register();
+	require_once TMDO_PATH . 'admin/class-tmdo-promotion-guard-notice.php';
+	TMDO_Promotion_Guard_Notice::register();
 }
 
 // ── WP-CLI ─────────────────────────────────────────────────────────────────