Add bat feature

[Copilot]

Adds a devcontainer feature for bat, a cat replacement with syntax highlighting and Git integration.

Changes

• src/bat/devcontainer-feature.json — Feature manifest; exposes a version option (default: "latest")
• src/bat/install.sh — Downloads the musl tar.gz from GitHub releases (sharkdp/bat), resolves version dynamically, extracts binary to /usr/local/bin; follows the same pattern as starship.rs, atuin.sh, etc.
• test/bat/test.sh — Verifies bat --version succeeds post-install
• .github/workflows/test.yaml — Adds bat to both test-autogenerated and test-scenarios matrices

Usage

"features": {
    "ghcr.io/devcontainer-community/devcontainer-features/bat:1": {}
}

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add bat feature</issue_title>
<issue_description>build on implementation in #104 </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add bat feature #111

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