ci: improve CI stability with parallel builds, Valgrind, and coverage

tests/functionaltests/proftest.c

@@ -136,12 +136,11 @@ _create_logs_dir(void)
 void
 _cleanup_dirs(void)
 {
-    /* Get test group from environment for consistent cleanup */
     const char *group_env = getenv("PROF_TEST_GROUP");
     int group = group_env ? atoi(group_env) : 0;
     int dir_id = (group >= 1 && group <= 4) ? group : stub_port;
     
-    fprintf(stderr, "[PROF_TEST] Cleaning up directories for group %d (dir_id %d)\\n\", group, dir_id);
+    fprintf(stderr, "[PROF_TEST] Cleaning up directories for group %d (dir_id %d)\n", group, dir_id);
     
     char cmd[512];
     snprintf(cmd, sizeof(cmd), "rm -rf ./test-files/%d", dir_id);