default.nix composes the three sub-modules. options.nix declares the
public surface (projects, regtest, fakewallet, tmux) so consumers can
wire values today even though config.nix is empty. lib.nix reserves
dev-env-scoped helpers separate from the global lnbits-sensei.lib.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
