The Webhook model was marked as non-public but is now exposed via
AuthType::KEY in the new Webhooks module, causing spec generation
to crash when building server SDK specs. The Installer Server.php
had a top-level require_once for vendor/autoload.php that fails
when CE is used as a composer dependency.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>