Local snapshot of the in-flight NixOS support: flake.nix + flake.lock + nix/
(crane host and client packages, services.punktfunk module, devShell).
Standalone — nothing in the Rust/Cargo tree references it. Held from push
pending its owning session's finalization (Skia-under-Nix follow-up + intended
per-workstream PR).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
