fix: install OpenBLAS in release CI for Ubuntu

The release workflow was missing the libopenblas-dev install step that
cmake.yml already has, causing BLAS-dependent builds to fail on Linux.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Transurgeon

.github/workflows/release.yml

@@ -15,6 +15,10 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Install BLAS (Ubuntu)
+        if: runner.os == 'Linux'
+        run: sudo apt-get update && sudo apt-get install -y libopenblas-dev
+
       - name: Configure CMake
         run: cmake -B build -S . -DCMAKE_BUILD_TYPE=Release