Nix build fails: filedescriptor output hash has no matching git dependency

What version of Codex is running?

0.69.0

What subscription do you have?

plus

Which model were you using?

_No response_

What platform is your computer?

NixOS (Linux 6.12.60 x86_64 unknown)

What issue are you seeing?

nix build .#codex-rs started failing after updating the flake because codex-rs/default.nix still listed filedescriptor-0.8.3 in cargoLock.outputHashes, even though commit 164265bed1eb0d0ebf453196c39c79809d4f1b7a switched filedescriptor (and portable-pty) back to the crates.io registry. Nix now errors with “A hash was specified for filedescriptor-0.8.3, but there is no corresponding git dependency.”

What steps can reproduce the bug?

1. Update latest from main.
2. Run nix build .#codex-rs.
3. Build fails with the missing git dependency error.

What is the expected behavior?

_No response_

Additional information

This is rather unfortunate as I just added this output hash yesterday to address #7759

My initial thought is to run nix build .#codex-rs in CI so that these sorts of issues are caught in PRs. I understand this may not be desirable as contributors may not know how to address problems that may come up with nix.