fix(2meet-data-optimizer): stop auto-activating entity bridge on install

- install() no longer switches the Hook Bus on or puts user/term/comment
  into dual_write; the now-unused maybe_autoactivate_entity_bridge() is gone
- Hook Bus and Mode_Manager defaults are off/disabled; sites with stored
  modes (incl. aeav_only) keep them since only unset keys use defaults
- Guard run_dbdelta()'s upgrade.php require like install_v2_tables() so
  install() can run under the integration test stub

Verify: InstallerV2Test::test_install_does_not_enable_entity_bridge,
  ModeManagerDefaultsTest; unit 602 OK, integration 421 OK
PR: PR-007

includes/class-tmdo-hook-bus-bridge.php

@@ -54,7 +54,7 @@ final class TMDO_Hook_Bus_Bridge {
 		if ( null !== self::$cache ) {
 			return self::$cache;
 		}
-		$value       = get_option( self::OPTION, '1' );  // Default ON as of v2.5.4.
+		$value       = get_option( self::OPTION, '0' );
 		self::$cache = ( '1' === (string) $value || true === $value );
 		return self::$cache;
 	}

includes/class-tmdo-installer.php

@@ -224,47 +224,12 @@ class TMDO_Installer {
 			add_option( 'wpdo_features', array(), '', 'no' );
 		}
 
-		// v2.5.4: one-time migration — enable Hook Bus + activate user/term/comment bridge.
-		self::maybe_autoactivate_entity_bridge();
-
 		// v2.15.0: one-time crypto migration — re-encrypt v1 CBC ciphertext as
 		// v2 GCM. Idempotent best-effort: skipped if no v1 ciphertext present
 		// or if the migration flag is already set.
 		self::maybe_migrate_crypto_v1_to_v2();
 	}
 
-	/**
-	 * One-time migration: enable Hook Bus and set user/term/comment to dual_write.
-	 *
-	 * Runs once per site (guarded by wpdo_entity_bridge_autoactivated_v2 flag).
-	 * Safe: dual_write still writes native EAV — zero data-loss risk.
-	 *
-	 * @return void
-	 */
-	private static function maybe_autoactivate_entity_bridge(): void {
-		if ( get_option( 'wpdo_entity_bridge_autoactivated_v2' ) ) {
-			return;
-		}
-
-		// Enable Hook Bus.
-		update_option( 'wpdo_hook_bus_enabled', '1', false );
-
-		// Upgrade user/term/comment from disabled → dual_write.
-		$modes = get_option( 'wpdo_bridge_modes', array() );
-		if ( ! is_array( $modes ) ) {
-			$modes = array();
-		}
-		foreach ( array( 'user', 'term', 'comment' ) as $type ) {
-			if ( ! isset( $modes[ $type ] ) || 'disabled' === $modes[ $type ] ) {
-				$modes[ $type ] = 'dual_write';
-			}
-		}
-		// post entity is intentionally left alone — it uses the legacy Feature_Flags FSM.
-		update_option( 'wpdo_bridge_modes', $modes, false );
-
-		update_option( 'wpdo_entity_bridge_autoactivated_v2', '1', false );
-	}
-
 	/**
 	 * One-time best-effort crypto migration v1 (CBC) → v2 (GCM) (v2.15.0).
 	 *
@@ -1303,7 +1268,10 @@ class TMDO_Installer {
 	 */
 	private static function run_dbdelta(): void {
 		global $wpdb;
-		require_once ABSPATH . 'wp-admin/includes/upgrade.php';
+		// Same guard as install_v2_tables(): integration tests provide a stub dbDelta().
+		if ( ! function_exists( 'dbDelta' ) ) {
+			require_once ABSPATH . 'wp-admin/includes/upgrade.php';
+		}
 
 		$charset = $wpdb->get_charset_collate();
 		$p       = $wpdb->prefix;

includes/engine/class-tmdo-mode-manager.php

@@ -65,16 +65,15 @@ final class TMDO_Mode_Manager {
 	private static ?array $cache = null;
 
 	/**
-	 * 預設模式（v2.5.4 起）：
-	 *   post    → disabled（由 Legacy Feature_Flags FSM 管理，不由 Mode_Manager 控制）
-	 *   user / term / comment → dual_write（安全雙寫：寫入 flat table + 原生 EAV，讀取仍走 EAV）
+	 * 預設模式：全部 disabled，由管理者明確選擇後才啟用 entity bridge。
+	 * 已存在 wpdo_bridge_modes 的站台（包含 aeav_only）以儲存值為準，不受影響。
 	 */
 	private static function defaults(): array {
 		return array(
 			'post'    => self::MODE_DISABLED,
-			'user'    => self::MODE_DUAL_WRITE,
-			'term'    => self::MODE_DUAL_WRITE,
-			'comment' => self::MODE_DUAL_WRITE,
+			'user'    => self::MODE_DISABLED,
+			'term'    => self::MODE_DISABLED,
+			'comment' => self::MODE_DISABLED,
 		);
 	}