Fix local: version: readonly variable error in feature install scripts

[Copilot]

Inside install(), readonly version="${VERSION:?}" creates a global readonly variable. When github_get_tag_for_version() is subsequently called, its local version="$2" declaration fails — bash won't shadow a global readonly with a local.

# Before (broken): local version="$2" conflicts with global readonly version
github_get_tag_for_version() {
    local repo="$1"
    local version="$2"          # ← fails: version is already readonly
    ...
    escaped_version="$(printf '%s' "$version" | sed 's/\./\\./g')"
}

# After (fixed): matches the pattern already used in src/fzf/install.sh
github_get_tag_for_version() {
    local repo="$1"
    local _version="$2"         # ← no conflict
    ...
    escaped_version="$(printf '%s' "$_version" | sed 's/\./\\./g')"
}

Changes

• 26 install.sh files — rename version → _version in github_get_tag_for_version(): astral.sh-uv, atuin.sh, bat, biomejs.dev, btop, charmbracelet-gum, chezmoi.io, delta, fd, icholy-ttygif, jj-vcs.dev, k9scli.io, neovim.io, opencode.ai, pi.dev, pulumi.com, rclone.org, restic.net, ripgrep, schpet-linear-cli, smallstep.com, starship.rs, swc.rs, yq, zellij.dev, zyedidia-eget
• 26 devcontainer-feature.json files — patch version bumps
• README.md — version table updated to match

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Some features will display ./install.sh: line xyz: local: version: readonly variable during installation</issue_title>
<issue_description></issue_description>

<agent_instructions>if you can, have a look at action workflow runs to identify affected features
otherwise
run the installation routine for each feature by yourself. in this case, don't forget running as sudo if needed, and with the required uppercase parameters as env vars</agent_instructions>

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

• Fixes Some features will display ./install.sh: line xyz: local: version: readonly variable during installation #211

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