Add ripgrep feature

[Copilot]

Adds a ripgrep devcontainer feature that installs the rg binary from GitHub releases (musl tar.gz), following the established feature pattern in this repo.

New files

• src/ripgrep/devcontainer-feature.json — feature metadata; exposes a version option (default: latest)
• src/ripgrep/install.sh — downloads and installs the musl tar.gz from BurntSushi/ripgrep releases; uses envsubst templating to handle the release-tag-embedded archive path; separates archiveName (ripgrep) from binaryName (rg)
• test/ripgrep/test.sh — verifies rg --version outputs ripgrep

CI

Added ripgrep to both test-autogenerated and test-scenarios matrices in test.yaml.

Usage

// devcontainer.json
{
  "features": {
    "ghcr.io/devcontainer-community/features/ripgrep:1": {
      "version": "latest"
    }
  }
}

Original prompt

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This section details on the original issue you should resolve

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

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

• Fixes Add ripgrep feature #115

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