ci: fix coverage to match Code Coverage job output

Use --extract '*/src/src/*' instead of --remove to properly filter
production code from tests. Coverage now shows 27.5% lines matching
the dedicated Code Coverage job.

ci-build.sh

@@ -259,16 +259,10 @@ build_and_test() {
         if [ "$run_coverage" = "yes" ]; then
             echo "--> Collecting coverage data..."
             if command -v lcov >/dev/null 2>&1; then
-                lcov --capture --directory . --output-file coverage.info \
+                lcov --capture --directory . --output-file coverage-full.info \
                     --rc lcov_branch_coverage=1 --ignore-errors inconsistent 2>&1 || true
-                # Remove test files, stubs, system headers - only keep src/ production code
-                lcov --remove coverage.info \
-                    '/usr/*' \
-                    '*/tests/*' \
-                    '*test*.c' \
-                    '*stub*.c' \
-                    '*/functionaltests/*' \
-                    '*/unittests/*' \
+                # Extract only production code from src/ directory, exclude tests
+                lcov --extract coverage-full.info '*/src/src/*' \
                     --output-file coverage.info \
                     --rc lcov_branch_coverage=1 --ignore-errors inconsistent 2>&1 || true
                 if [ -f coverage.info ] && [ -s coverage.info ]; then