feat(2meet-data-optimizer): guard orphaned flat-table groups

- On init:1, re-register aeav_only groups whose flat table exists and whose definition is in wpdo_registry_meta but no active plugin registers them, so their data stays readable (routing only, never DDL)
- Keys owned by a live group, or with rows in native meta (newer data written while orphaned), are left alone; the native-meta check is cached for a day
- Surface restored groups via Site Health (wpdo_orphaned_entity_groups), the admin Doctor tab, and wp wpdo doctor
- Verify: EntityRegistryRestoreTest (9), OrphanGroupRestoreTest (7); core unit 622 / integration 439, HP 141/49, WC 10/22 OK; dry-run on dev20–22 restores 16/17/4 groups, keeps hp_taxonomy hp_sort_order/hp_icon on native
- PR: PR-018

cli/class-tmdo-cli.php

@@ -349,6 +349,21 @@ class TMDO_CLI {
 			$all_ok = false;
 		}
 
+		// ── Orphaned entity groups (restored from wpdo_registry_meta) ───────────
+		foreach ( TMDO_Entity_Registry::get_restored_groups() as $r ) {
+			WP_CLI::warning(
+				sprintf(
+					'  [ORPHAN] %s/%s — no active plugin registers it; restored %d field(s) from wpdo_registry_meta%s%s. Reactivate the owner or write the data back before removing it.',
+					$r['entity_type'],
+					$r['group'],
+					$r['fields'],
+					$r['skipped'] ? ' (skipped, owned by another group: ' . implode( ', ', $r['skipped'] ) . ')' : '',
+					$r['native'] ? ' (left on native meta, which has newer data: ' . implode( ', ', $r['native'] ) . ')' : ''
+				)
+			);
+			$all_ok = false;
+		}
+
 		// Check recent errors.
 		$errors = TMDO_Logger::get_recent( '', 5 );
 		if ( ! empty( $errors ) ) {