feat(2meet-data-optimizer): backfill writes made while the Hook Bus was off

- When an entity goes from disabled to dual_write / shadow_read, or the Hook Bus flag is switched on, a single WP-Cron event (tmdo_drift_resync, one per entity, 60 s later) runs drift-check --fix for the entities that keep native meta, so values written while flat was bypassed land in flat. aeav_only is never touched.
- A full fix instead of the planned post_modified_gmt increment (decision 2026-09-27): meta-only writes such as WooCommerce's direct stock SQL do not bump post_modified. No wpdo_bridge_off_since.
- The resync hook is cleared on deactivate / uninstall (literal name: uninstall.php does not load TMDO_Drift_Check).
- Verify: DriftCheckTest resync cases (RED before); dev36 end to end with real WP-Cron: write while user disabled → miss 1 → bridge-mode user dual_write schedules tmdo_drift_resync [user] → run → drift 0.
- PR: PR-074

includes/class-tmdo-core.php

@@ -299,6 +299,13 @@ class TMDO_Core {
 		// 1.2.0: daily flat-vs-native drift sample (read by the post query router).
 		add_action( 'wpdo_daily_health_check', array( 'TMDO_Drift_Check', 'cron_tick' ) );
 
+		// 1.2.0: rebuild flat from native after writes bypassed it (entity was
+		// disabled, or the Hook Bus was off).
+		add_action( 'wpdo_bridge_mode_changed', array( 'TMDO_Drift_Check', 'on_mode_changed' ), 10, 3 );
+		add_action( 'update_option_' . TMDO_Hook_Bus_Bridge::OPTION, array( 'TMDO_Drift_Check', 'on_hook_bus_toggled' ), 10, 2 );
+		add_action( 'add_option_' . TMDO_Hook_Bus_Bridge::OPTION, array( 'TMDO_Drift_Check', 'on_hook_bus_added' ), 10, 2 );
+		add_action( TMDO_Drift_Check::RESYNC_HOOK, array( 'TMDO_Drift_Check', 'run_scheduled_fix' ) );
+
 		// v2.3.0 M6: daily snapshot prune cron (paired with health check).
 		add_action( 'wpdo_snapshot_prune_daily', array( 'TMDO_Snapshot_Pruner', 'cron_run' ) );