[rsa25519]

(I'm not shooting the messenger here) If so, that would mean pushing/pulling within the LAN only... which Git supports already

[toyg]

If Github is unreachable, you don’t have a bugtracker, wiki etc. - you are working “blind”.

[cloudhead]

You can't push within LAN and then have that automatically available when online to the wider network, unless you have some form of continuous replication to some public-facing host. This is what Radicle does for you.