Hash-pinned external inputs for hermetic, reproducible Nix builds — without flakes or second-class VCS support

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Nixtamal is a dependency pinning tool for Nix that provides hash-pinned external inputs for hermetic, reproducible builds without requiring flakes or experimental features. It uses a declarative KDL manifest file to manage inputs, supports VCS systems like Darcs and Pijul not available in Nix builtins, allows custom hash algorithms including BLAKE3, and enables user-defined freshness checks. The tool separates manifest and lockfile duties, works alongside other pinning tools, and leverages Nixpkgs fetchers for feature-rich input management.