fix: nix packaging

[es-sai-fi]

Solves #146.

[greptile-apps]

Greptile Summary

This PR fixes the Nix packaging for gitv by correcting the derivation structure and preventing build artifacts from polluting the repository. Splits name = "gitv" into pname = "gitv" + version = "dev" to conform with Nixpkgs conventions, and stubs VERGEN_GIT_DESCRIBE/VERGEN_BUILD_DATE so vergen doesn't attempt git access during the sandboxed Nix build. Adds /result to .gitignore to prevent the nix build output symlink from being committed; /result-* for multi-output builds is not yet covered.

Important Files Changed

Filename	Overview
.gitignore	Adds /result to prevent the Nix build artifact symlink from being committed; /result-* for multi-output builds is not covered.
package.nix	Fixes Nix derivation by splitting name into pname+version, and stubs out vergen env vars so the build succeeds without git access.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["nix build"] --> B["rustPlatform.buildRustPackage"]
    B --> C["Set env vars\nVERGEN_GIT_DESCRIBE=dev\nVERGEN_BUILD_DATE=unknown"]
    C --> D["cargo build\n(no git access)"]
    D --> E["result symlink\n→ /nix/store/…-gitv-0.4.3"]
    E --> F{".gitignore\n/result\n/result-*?"}
    F -->|"/result matched"| G["result NOT committed ✓"]
    F -->|"result-bin / result-dev\nnot matched"| H["result-* may be committed ⚠"]

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