ci: remove nu install

.github/actions/setup-shell-tools/action.yml

@@ -1,50 +0,0 @@
-name: 'Setup Shell Tools'
-description: 'Sets up Nushell and Just for cross-platform development'
-branding:
-  icon: 'terminal'
-  color: 'purple'
-
-outputs:
-  nu-version:
-    description: 'Installed Nushell version'
-    value: ${{ steps.nu-info.outputs.version }}
-  just-version:
-    description: 'Installed Just version'
-    value: ${{ steps.just-info.outputs.version }}
-
-runs:
-  using: 'composite'
-  steps:
-    - name: Setup Nushell
-      run: |
-        # Install Nushell following official docs
-        curl -s https://api.github.com/repos/nushell/nushell/releases/latest \
-          | grep "browser_download_url.*x86_64-unknown-linux-gnu" \
-          | cut -d : -f 2,3 \
-          | tr -d \" \
-          | wget -qi -
-        tar xf nu-*-x86_64-unknown-linux-gnu.tar.gz
-        sudo mkdir -p /usr/local/bin
-        sudo cp nu-*/nu /usr/local/bin/
-        sudo chmod +x /usr/local/bin/nu
-        echo "/usr/local/bin" >> $GITHUB_PATH
-        # Add to current PATH for immediate use
-        export PATH="/usr/local/bin:$PATH"
-        # Verify installation and set as default shell
-        nu --version
-        echo "SHELL=/usr/local/bin/nu" >> $GITHUB_ENV
-      shell: bash
-
-    - name: Get Nushell version
-      id: nu-info
-      run: echo "version=$(/usr/local/bin/nu --version | head -n1)" >> $GITHUB_OUTPUT
-      shell: bash
-
-    - name: Setup Just
-      uses: extractions/setup-just@v2
-      shell: bash
-
-    - name: Get Just version
-      id: just-info
-      run: echo "version=$(just --version)" >> $GITHUB_OUTPUT
-      shell: bash

.github/workflows/ci.yml

@@ -17,9 +17,6 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
-      - name: Setup Shell Tools
-        uses: ./.github/actions/setup-shell-tools
-
       - name: Setup Bun
         uses: oven-sh/setup-bun@v2
         with: