Code: Rust feature implementation

Compare how different agentic coding tools and models implement a rust feature. Works on my jump-start-tools project.

Prompt: Implement the mode=git feature for the "use" subcommand in the jump-start-tools Rust CLI.

Starting codebase: https://github.com/kevinschaul/jump-start-tools/tree/de15260b46318c29f6b2435ff068fb9c42fc2806

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