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/bootstrap.php

@@ -302,6 +302,7 @@ if ( ! function_exists( 'wp_strip_all_tags' ) ) { function wp_strip_all_tags( st
 if ( ! function_exists( 'get_option' ) ) { function get_option( string $key, $default = false ) { return $GLOBALS['_wp_options'][ $key ] ?? $default; } }
 if ( ! function_exists( 'update_option' ) ) { function update_option( string $key, $value ): bool { $GLOBALS['_wp_options'][ $key ] = $value; return true; } }
 if ( ! function_exists( 'delete_option' ) ) { function delete_option( string $key ): bool { unset( $GLOBALS['_wp_options'][ $key ] ); return true; } }
+if ( ! function_exists( 'add_option' ) ) { function add_option( string $key, $value = '', $deprecated = '', $autoload = null ): bool { if ( array_key_exists( $key, $GLOBALS['_wp_options'] ?? array() ) ) { return false; } $GLOBALS['_wp_options'][ $key ] = $value; return true; } }
 if ( ! function_exists( 'get_transient' ) ) { function get_transient( string $key ) { return $GLOBALS['_wp_transients'][ $key ] ?? false; } }
 if ( ! function_exists( 'set_transient' ) ) { function set_transient( string $key, $value, int $exp = 0 ): bool { $GLOBALS['_wp_transients'][ $key ] = $value; return true; } }
 if ( ! function_exists( 'delete_transient' ) ) { function delete_transient( string $key ): bool { unset( $GLOBALS['_wp_transients'][ $key ] ); return true; } }