Froglet v0.4.3 public beta

Public beta: free native publishing, sharing, and requester invocation for supported macOS and Linux hosts.

This release adds the relay/Tor backend socket to native installation preflight. Setup now reports an occupied backend port before activating a service, instead of failing after installation. The release preserves existing identity and service state.

The stable label remains gated on clean-machine agent qualification and five first-time-user trials.