Remove modules/zram.nix — it only wrapped the native zramSwap.enable toggle
without adding anything — and enable zram inline on neogaia instead. Rewrite
the touched comments to describe only the current file content, and record
the in-file-comment convention in CLAUDE.md.
Select the CachyOS kernel per-Host via boot.kernelPackages, enable Intel
microcode and redistributable firmware (ath10k for the QCA6174 wifi), and
move zram behind a toggle Module. Declare the chaotic binary cache in the
base Nix settings (extra-substituters/keys) so the built system fetches the
kernel from nyx-cache rather than compiling it.
