My lord it's fixed!
Thanks for the hints!
Actually what was wrong is that I added git-remote-nostr to path with a tilde like
'~/.cargo/bin'
What worked was
'$HOME/.cargo/bin'
I don't actually know why but in the shell everything seemed fine I could invoke the command but git could not access it the first way.
I'll zap your Offer in SatShoot!
Thanks for the help amd for your great project!
I feel blessed!