Release v0.3.6 — coroutine-legacy per-request state-reset stack + opcache advisory

Completes the PHP-FPM "fresh process per request" contract for the require_once-legacy class.
- ext-zealphp 0.3.25: per-request function-static + class-static reset (mirror shutdown_executor); free_zend_constant worker-exit fix.
- App::opcacheLegacyBootCheck() advisory for opcache + coroutine-legacy.
- Validated PHP 8.4 + ASAN across a 12-app sweep; WordPress serves public + login-auth + comment-write end-to-end.
- phpt 38/38, PHPStan L10, phpunit 3225/3225.