Separate user identity (data) from the reusable modules, and let a host
declare any number of users instead of exactly one.
- users/registry.nix: per-user identity (name, email, groups, authorized
and signing keys) as the single source of identity; no user data is
hardcoded in the modules.
- mkHost takes a `users` set keyed by username; per-user identity is
injected into each home config via the `identity` module arg
(extraSpecialArgs is per-host, so it cannot carry per-user data).
- modules/users.nix builds accounts from the registry; modules/ssh.nix no
longer defines authorized keys (the registry owns them); home/git.nix
and home/desktop.nix read `identity`; users/emmathorpe/work.nix drops
its now-redundant git identity override.
- Restructure the tree: users/, home/, modules/, hosts/, lib/ replace the
former lyrathorpe/ and system/ layout.
- Add standalone homeConfigurations (the portable subset: shell, git,
editor, claude) and an exported homeModules output for use on machines
not managed by this flake, or as an input to other flakes.
Behaviour-preserving for existing hosts: lyrathorpe-mbp and
emmathorpe-edaas evaluate to identical derivations; lyrathorpe-t400,
lyrathorpe-macpro31 and lyrathorpe-rpi5 differ only by de-duplicating a
repeated authorized_keys entry. Fixes the SSH authorized-key leak (one
user's key was applied to every account), the hardcoded default git
identity, and the hardcoded EDaaS linger setting.
Emma Thorpe
10cc6cceed