Export fatally crashes: mu-migration helpers.php not loaded because vendor/autoload.php is missing

[superdav42]

Bug

Calling wu_exporter_export() (synchronous or via admin UI) fatally crashes with:

Fatal error: Call to undefined function TenUp\MU_Migration\Helpers\maybe_switch_to_blog()
in inc/site-exporter/mu-migration/includes/commands/class-mu-migration-export.php:396

Root Cause

Site_Exporter::load_dependencies() gates ALL file loading behind a check for inc/site-exporter/mu-migration/vendor/autoload.php, but that directory is not tracked in git and does not exist:

public function load_dependencies(): void {
    $base_path = wu_path('inc/site-exporter/mu-migration');
    if (file_exists($base_path . '/vendor/autoload.php')) {  // always false
        require_once $base_path . '/vendor/autoload.php';
        require_once $base_path . '/includes/helpers.php';    // never loaded
        // ...
    }
}

Meanwhile, the ExportCommand and ImportCommand classes ARE autoloaded by the main Composer classmap (in vendor/composer/autoload_classmap.php), so they can be instantiated — but they crash immediately when calling helper functions that were never loaded.

Steps to Reproduce

wp eval 'wu_exporter_export(2, ["uploads" => true], false);' --url=http://wordpress.local:8080

Or click "Export" on any site in the admin UI.

Expected

Export creates a ZIP file.

Actual

Fatal error — helpers.php functions undefined.

Fix

load_dependencies() should load helpers.php and the command classes unconditionally (they have no external dependency). The vendor/autoload.php check should only gate loading of the Alchemy\Zippy\Zippy dependency (which is handled by the separate Zippy issue).

Files to modify

• EDIT: inc/site-exporter/class-site-exporter.php:1618-1632 — restructure load_dependencies() to always load helpers.php and command files; only gate vendor autoloader behind the file_exists check

Severity

Blocker — export is completely non-functional.

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[superdav42]

CLAIM_RELEASED reason=worker_branch_orphan runner=dave ts=2026-04-30T06:52:50Z

[superdav42]

WORKER_BRANCH_ORPHAN branch=feature/auto-20260430-004907-gh1004 session=issue-1004 ts=2026-04-30T06:52:53Z

This worker pushed branch feature/auto-20260430-004907-gh1004 but no PR could be opened automatically. To recover, open a PR manually:

gh pr create --head feature/auto-20260430-004907-gh1004 --base main --repo Ultimate-Multisite/ultimate-multisite