Implement remaining Claude Code review suggestions

Co-authored-by: Valorith <76063792+Valorith@users.noreply.github.com>

.github/workflows/release.yaml

@@ -20,7 +20,7 @@ jobs:
       - name: Setup ccache
         uses: hendrikmuhs/ccache-action@v1.2
         with:
-          key: ${{ runner.os }}-release-ccache
+          key: ${{ runner.os }}-release-ccache-${{ hashFiles('.github/workflows/release.yaml') }}
 
       - name: Install dependencies
         run: |
@@ -83,7 +83,10 @@ jobs:
           fi
           
           echo "Successfully packaged $FILE_COUNT files"
-          ls -la eqemu-server-linux-x64.zip
+          ls -lh eqemu-server-linux-x64.zip
+          echo ""
+          echo "Package contents:"
+          unzip -l eqemu-server-linux-x64.zip
 
       - name: Upload artifact
         uses: actions/upload-artifact@v4
@@ -122,7 +125,7 @@ jobs:
 
       - name: Build
         shell: pwsh
-        run: cmake --build build --config RelWithDebInfo --target ALL_BUILD -- /m
+        run: cmake --build build --config RelWithDebInfo --target ALL_BUILD -- /m:4
 
       - name: Package binaries
         shell: pwsh