fix(2meet-data-optimizer): resync flat rows from native meta after each write

- dual_write / shadow_read no longer write flat in the update_/add_/
  delete_{type}_metadata pre-filters, before WP decides whether native
  changes at all. added_/updated_/deleted_{type}_meta (priority 1) call
  TMDO_Hook_Bus::sync_from_native(), which copies the entity's first native
  row (plain SQL, NULL when gone) into flat. Flat now follows native when WP
  skips (same value), refuses (non-matching prev_value, add $unique on an
  existing key) or deletes (also delete_all: touched IDs are collected from
  the meta IDs in delete_{type}_meta), and a flat value left stale by a
  direct SQL write heals on the next write.
- update_metadata_by_mid key changes: the old key is remembered in
  update_{type}_metadata_by_mid and re-synced too.
- wpdo_after_write / wpdo_after_delete fire from the sync with the same
  arguments; aeav_only keeps the pre-filter short-circuit unchanged.
- $internal_ops lock key includes the entity type (user 5 ≠ post 5).
- Live suite resync: 4 entities × 2 modes × 3 scenarios (old code: 16 of
  24 FAIL); integration: pre-filter leaves flat to the sync, delete_all
  re-syncs every touched user.
- Verify: live resync + shadow_write + serialized + zero_side_effect 33/33
  PASS; unit 687 OK, integration 485 OK, phpcs (phpcs.xml) 0, stan OK
- PR: PR-057

tests/integration/PostStatusSyncTest.php

@@ -160,7 +160,8 @@ class PostStatusSyncTest extends TestCase {
 		TMDO_Post_Status_Sync::run();
 		$mode = new ReflectionProperty( WPDO_Mode_Manager::class, 'cache' );
 		$mode->setAccessible( true );
-		$mode->setValue( null, array( 'post' => 'dual_write', 'user' => 'disabled', 'term' => 'disabled', 'comment' => 'disabled' ) );
+		// aeav_only: the pre-filter itself writes flat (dual_write syncs from native after the write).
+		$mode->setValue( null, array( 'post' => 'aeav_only', 'user' => 'disabled', 'term' => 'disabled', 'comment' => 'disabled' ) );
 		$GLOBALS['_wp_posts'][3]       = (object) array( 'ID' => 3, 'post_type' => 'hp_listing', 'post_status' => 'pending', 'post_date' => '2026-03-01 10:00:00' );
 		$GLOBALS['_wp_current_filter'] = 'update_post_metadata';