CVE-2026-44738: Grav: Twig sandbox allows editor-role users to exfiltrate all plugin secrets via Config::toArray()

The Twig sandbox allow-list permits any user with the admin.pages role to call config.toArray() from within a page body, dumping the entire merged site configuration — including all plugin secrets (SMTP passwords, AWS keys, OAuth client secrets, API tokens) — into the rendered HTML. No administrator privileges are required.