Add Configuration Namespace

Configuration-Namespace.md

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+# Configuration Namespace
+
+All Innovation Factory specific configuration options are namespaced
+under `athenix.*` to avoid collisions with standard NixOS options.
+
+## athenix.host
+
+Host-level hardware and platform configuration.
+
+Common options:
+- `athenix.host.filesystem.device`
+- `athenix.host.filesystem.swapSize`
+- `athenix.host.buildMethods`
+- `athenix.host.useHostPrefix`
+- `athenix.host.wsl.user`
+
+These options define how the system boots, installs, and builds artifacts.
+
+## athenix.sw
+
+Defines the software profile for a system.
+
+Key options:
+- `athenix.sw.type`
+- `athenix.sw.kioskUrl`
+- `athenix.sw.extraPackages`
+- `athenix.sw.excludePackages`
+- `athenix.sw.remoteBuild.*`
+- `athenix.sw.python.enable`
+
+System type controls which software stack is applied.
+
+## athenix.users
+
+User account definitions and enablement.
+
+User options include:
+- Shell and groups
+- SSH keys
+- Password hashes
+- External user modules
+
+Users are enabled per-host via `inventory.nix`.
+
+## athenix.system
+
+System-wide behaviors such as garbage collection and maintenance.
+
+Typical configuration:
+- Automatic GC
+- Store optimization
+- Retention policies
+
+## athenix.forUser
+
+Convenience option to enable a single user on a system in one line.