nix: bump flake.lock, fix nitpick in drv, add .envrc

[es-sai-fi]

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[greptile-apps]

Greptile Summary

This PR makes three small, related improvements to the Nix packaging setup: it bumps the pinned nixpkgs revision to a more recent nixos-unstable commit, adds a standard direnv .envrc to auto-activate the flake dev-shell when entering the directory, and cleans up a redundant with lib; scope in package.nix.

• flake.lock: Routine nixpkgs bump (2fc6539 → 62dc67aa); narHash and lastModified are updated consistently.
• .envrc: Adds standard watch_file directives for flake.lock and flake.nix so direnv re-evaluates the shell when either changes, followed by use flake to activate the dev environment. This is the idiomatic pattern for Nix flake projects.
• package.nix: Removes the outer with lib; scope from the meta block. The only attribute that needed it was license, which already has its own with lib.licenses; scope — so the removal is correct and improves clarity by reducing implicit namespace pollution.

Important Files Changed

Filename	Overview
.envrc	New direnv config that watches flake.lock and flake.nix and activates the Nix flake environment; standard and correct pattern for Nix flake projects.
flake.lock	Routine bump of the pinned nixpkgs revision (nixos-unstable) to a newer commit; narHash and lastModified updated consistently.
package.nix	Removes unnecessary top-level with lib; scope from the meta block; lib.licenses is still correctly referenced explicitly in the license line, so the change is safe.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Developer enters project directory] --> B{direnv installed?}
    B -- Yes --> C[.envrc is loaded automatically]
    B -- No --> G[Manual: nix develop]
    C --> D[watch_file flake.lock\nwatch_file flake.nix]
    D --> E[use flake]
    E --> F[Nix evaluates flake.nix\ndevShells.default via shell.nix]
    F --> H[Dev environment activated\ntools & dependencies available]
    G --> H
    D --> I{flake.lock or flake.nix changed?}
    I -- Yes --> C

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_{Last reviewed commit: d42fa2d}