PHP SDK: Timeout cancellation exceptions not thrown correctly

Steps to reproduce

1. Set up an environment to scan files with PHP SDK
2. Set timeout in VaaS options very low:

$options = new VaasOptions(
    useHashLookup: true,
    useCache: true,
    vaasUrl: getenv("VAAS_URL"),
    timeout: 1
);

3. Scan a file that is a few megabytes big
4. Wait for the exception that should be thrown

Expected

1. Set a timeout
2. A file scan takes too long
3. A proper exception is thrown telling me that it was canceled due to a timeout

Actual

PHP Fatal error:  Uncaught Amp\CancelledException: The operation was cancelled in /home/lennart/Projects/github.com/vaas/php/examples/VaasExample/vendor/amphp/amp/src/Internal/Cancellable.php:56
Next Amp\Future\UnhandledFutureError: Unhandled future: Amp\CancelledException: "The operation was cancelled"; Await the Future with Future::await() before the future is destroyed or use Future::ignore() to suppress this exception. Enable assertions and set AMP_DEBUG=true in the process environment to track its origin. in /home/lennart/Projects/github.com/vaas/php/examples/VaasExample/vendor/amphp/amp/src/Internal/FutureState.php:53
Next Revolt\EventLoop\UncaughtThrowable: Uncaught Amp\Future\UnhandledFutureError thrown in event loop callback Amp\Internal\FutureState::{closure:Amp\Internal\FutureState::__destruct():54} defined in /home/lennart/Projects/github.com/vaas/php/examples/VaasExample/vendor/amphp/amp/src/Internal/FutureState.php:54; use Revolt\EventLoop::setErrorHandler() to gracefully handle such exceptions: Unhandled future: Amp\CancelledException: "The operation was cancelled"; Await the Future with Future::await() before the future is destroyed or use Future::ignore() to suppress this exception. Enable assertions and set AMP_DEBUG=true in the process environment to track its origin. in /home/lennart/Projects/github.com/vaas/php/examples/VaasExample/vendor/revolt/event-loop/src/EventLoop/UncaughtThrowable.php:13
PHP Fatal error:  Uncaught FiberError: Cannot suspend in a force-closed fiber in /home/lennart/Projects/github.com/vaas/php/examples/VaasExample/vendor/revolt/event-loop/src/EventLoop/Internal/AbstractDriver.php:625

Nextcloud App

This is very easy to see in the G Data Antivirus app for Nextcloud. Simply pull up an instance or start the devcontainer, set the timeout to 1s in the app settings, and upload a file that is approx. >5MB. At this point, I would expect to see an error as a user, but nothing happens and the file is blocked because it is being “processed” by the scan process like forever.

Start by reproducing the PHP SDK scan with VaasOptions timeout set to 1 second and a file larger than 5 MB, then trace how the timeout cancellation is handled. Verify the scan reports a proper timeout exception to the caller without an unhandled future, fatal fiber error, or indefinitely blocked scan.