fix(ci): install ridk

Add explicit ridk installation and invocation on Windows to ensure MSYS2 tools are available.

Author: zah

.agents/tasks/2025/06/30-0638-windows-ridk-fix

@@ -0,0 +1 @@
+The Windows CI failed now because it didn't have ridk installed

.github/workflows/ci.yml

@@ -53,7 +53,8 @@ jobs:
         if: runner.os == 'Windows'
         shell: bash
         run: |
-          ridk exec pacman -S --noconfirm base-devel mingw-w64-ucrt-x86_64-toolchain
+          ruby -S ridk install 3
+          ruby -S ridk exec pacman -S --noconfirm base-devel mingw-w64-ucrt-x86_64-toolchain
       - name: Setup Rust
         uses: dtolnay/rust-toolchain@stable
         with: