Lock follows paths are absolute from the root node; nomarchy's nodes move
one level down in the composed downstream lock, so ["nixpkgs"] must
become ["nomarchy","nixpkgs"] — otherwise every follows dangles
("input 'nomarchy/home-manager/nixpkgs' follows a non-existent input").
Verified: the composed lock now resolves the full input tree with
`nix flake metadata --offline`.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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