ci: integrate coverage into linux arch job, remove duplicate

- Linux arch job now uploads coverage.info as artifact
- ci-build.sh saves coverage.info before cleanup
- Removed separate coverage job (was duplicating arch build)
- Saves ~25% CI time by eliminating redundant build

ci-build.sh

@@ -286,6 +286,13 @@ build_and_test() {
         fi
 
         ./profanity -v
+
+        # Save coverage.info before cleanup (for CI artifact)
+        if [ "$run_coverage" = "yes" ] && [ -f coverage.info ]; then
+            cp coverage.info ../coverage.info
+            echo "Coverage report saved to coverage.info"
+        fi
+
         $MAKE clean
 
         cd ..