fix(2meet-data-optimizer): upgrade existing flat tables from WP-CLI or WP-Cron only

- a changed group definition no longer runs dbDelta on an existing table
  inside a web request (seconds to minutes on a large table, and every
  concurrent request tried it): the group is recorded in tmdo_schema_deferred
  and tmdo_ensure_group_indexes is scheduled, whose request upgrades it
- meanwhile the group stays native: Hook Bus field lookups return no field and
  the router treats it as drifting; afterwards a drift fix
  (tmdo_drift_resync) rebuilds the writes that skipped the flat table
- new tables are still created at once; aeav_only upgrades at once (the flat
  table is the only copy); doctor lists deferred groups
- Verify: SchemaUpgradeDeferralTest, Hook Bus and router tests, integration
  582, unit 701, phpcs, stan; dev36 live cycle in the 2.3 acceptance
- PR: PR-107

cli/class-tmdo-cli.php

@@ -142,6 +142,10 @@ class TMDO_CLI {
 		foreach ( $violations as $entity_type => $integrations ) {
 			WP_CLI::warning( "  [GUARD] {$entity_type} is aeav_only while " . implode( ', ', $integrations ) . " reads native meta — write flat back with `wp tmdo bridge-restore-native {$entity_type} --demote`." );
 		}
+		$deferred = array_keys( (array) get_option( TMDO_Schema_Manager::DEFERRED_OPTION, array() ) );
+		if ( $deferred ) {
+			WP_CLI::warning( '  [SCHEMA] table upgrades not done yet (these groups use native meta meanwhile): ' . implode( ', ', $deferred ) . ' — see the error log if this run did not finish them.' );
+		}
 		$pending = TMDO_Schema_Manager::pending_indexes();
 		if ( $pending ) {
 			WP_CLI::warning( '  [INDEX] declared indexes not added yet: ' . implode( ', ', $pending ) . ' — still missing after this run: another process is adding them, or the ALTER failed (see the `schema.index_failed` log).' );