Apple's built-in ssh-agent has no sk-api/libfido2 support and refuses
signing operations for ed25519-sk / ecdsa-sk hardware keys. Enable the
existing metacfg.security.ssh module (which runs pkgs.openssh's
ssh-agent under launchd) via the common darwin suite, and export
SSH_AUTH_SOCK from environment.shellInit so bash, zsh, and fish (via
/etc/fish/foreign-env/shellInit) all point at the nix-managed socket.
- Commented out default SSH service enablement in common suite.
- Updated SSH agent configuration to use dynamic user paths.
- Removed outdated SSH keys and added missing key descriptions.
This commit enables the 'base' edition in the default.nix configuration file within the Darwin suites module. This update provides the necessary settings for the base installation, enhancing the flexibility of system setup.
