Add fd feature

[Copilot]

Adds a devcontainer feature for fd, a fast find alternative, following the established pattern in this repo.

New files

• src/fd/devcontainer-feature.json — feature manifest with a version option (default: latest)
• src/fd/install.sh — downloads the musl tar.gz from sharkdp/fd GitHub releases; uses envsubst to resolve the templated archive path (e.g. fd-v10.2.0-x86_64-unknown-linux-musl/fd) and dpkg --print-architecture for arch mapping
• test/fd/test.sh — verifies fd --version succeeds

CI

• Added fd to both test-autogenerated and test-scenarios matrices in .github/workflows/test.yaml

Usage

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

Original prompt

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This section details on the original issue you should resolve

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

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

• Fixes Add fd feature #112

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