Uses the importer module with extraModules to enable clan.core.state-version,
which provides automatic state version management for all machines.

Configures the state-version clan service for all machines using the
inventory.instances configuration as documented in clan-core.

Updates all inputs to latest versions

Allows for more recent packages and fixes potential evaluation issues

Evaluates all NixOS and Darwin configurations on every push and pull request.
Also checks code formatting and runs basic flake checks.