Add an 8G swapfile for headroom during nix builds (7.7G RAM, no prior swap) and bring nodejs (bundles npm) into the development profile. Also picks up latest flake.lock input updates. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01C5fRUDLRzDhoKhEqa69cyR