chore(nix): bump nixpkgs 24.11 → 25.11 + refresh lock

[WomB0ComB0]

Bumps nixpkgs channel 24.11 → 25.11 (current stable) and refreshes flake.lock. Closes the reproducibility gap — repos without a committed lockfile now have one, and the shared channel matches across the org.

Mechanical: no changes to devPackages or shellHook.

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: a9e7ba52-bb0e-47c9-9136-b527da324029

📥 Commits

Reviewing files that changed from the base of the PR and between fa2a063 and fa42bbe.

⛔ Files ignored due to path filters (1)

• flake.lock is excluded by !**/*.lock

📒 Files selected for processing (1)

• flake.nix

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/bump-nixpkgs-25.11

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[gemini-code-assist]

Code Review

This pull request updates the nixpkgs input in flake.nix from version 24.11 to 25.11 and introduces the corresponding flake.lock file. Feedback suggests optimizing the flake evaluation by ensuring the rust-overlay input follows the main nixpkgs input, which would prevent the inclusion of multiple nixpkgs versions in the dependency graph and reduce closure size.

[gemini-code-assist]

To optimize the flake evaluation and reduce the closure size, it is recommended to make the rust-overlay input follow the main nixpkgs input. This prevents Nix from fetching and evaluating two different versions of nixpkgs (the stable 25.11 and the unstable version used by default by the overlay). Currently, the flake.lock shows that rust-overlay is pulling in an additional nixpkgs-unstable instance.

    nixpkgs.url = "github:nixos/nixpkgs/nixos-25.11";
    rust-overlay.inputs.nixpkgs.follows = "nixpkgs";