fix: Install kcov from source in coverage workflow

- kcov is not available in default Ubuntu repositories
- Build kcov v42 from source with all required dependencies
- This should resolve the coverage workflow failure

Fixes coverage workflow installation issue

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: aRustyDev

.github/workflows/coverage.yml

@@ -22,7 +22,29 @@ jobs:
       - name: Install dependencies
         run: |
           sudo apt-get update
-          sudo apt-get install -y bats kcov
+          sudo apt-get install -y bats
+          
+          # Install kcov dependencies
+          sudo apt-get install -y \
+            cmake \
+            binutils-dev \
+            libcurl4-openssl-dev \
+            zlib1g-dev \
+            libdw-dev \
+            libiberty-dev
+          
+          # Build and install kcov from source
+          cd /tmp
+          wget https://github.com/SimonKagstrom/kcov/archive/v42.tar.gz
+          tar xzf v42.tar.gz
+          cd kcov-42
+          mkdir build && cd build
+          cmake ..
+          make -j$(nproc)
+          sudo make install
+          
+          # Verify kcov installation
+          kcov --version
 
           # Install bashcov for additional coverage
           sudo gem install bashcov