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

tests/integration/InstallerV2Test.php

@@ -111,6 +111,19 @@ class InstallerV2Test extends TestCase {
 		}
 	}
 
+	public function test_install_does_not_enable_entity_bridge(): void {
+		delete_option( 'wpdo_hook_bus_enabled' );
+		delete_option( 'wpdo_bridge_modes' );
+		delete_option( 'wpdo_entity_bridge_autoactivated_v2' );
+		// Skip the crypto step: it queries $wpdb->options, which InstallerCleanupTest leaves pointing at its own prefix.
+		update_option( 'wpdo_crypto_migrated_v2', '1' );
+
+		TMDO_Installer::install();
+
+		$this->assertFalse( get_option( 'wpdo_hook_bus_enabled' ), 'install() must not switch the Hook Bus on' );
+		$this->assertFalse( get_option( 'wpdo_bridge_modes' ), 'install() must not write bridge modes' );
+	}
+
 	public static function tearDownAfterClass(): void {
 		// Leave v2 tables in place for subsequent tests / dev convenience.
 		// Cleanup happens via wp wpdo cleanup-uae-tables --confirm in real upgrades.