Linux::Event::Fork

Minimal async child spawning on top of Linux::Event.

CI Notes

If GitHub Actions fails during:

Run shogo82148/actions-setup-perl@v1
install perl
Error: Error: failed to verify ...

This is an upstream attestation verification issue in the action, not a problem with this distribution.

If it occurs, you can fix CI by either:

1. Pinning to a specific action release tag instead of @v1
2. Disabling verification in the action config (if supported)
3. Switching to actions/setup-perl alternative

This does not affect CPAN builds.