Function callables_with_outbound

tests/test_lang_contract.c:178–182

Callables (Function OR Method) that have >=1 outbound edge — the cross-language * "calls are attributed to the calling routine, not lumped on the file/Module * node" invariant (a mis-attributed call would leave the callable at degree 0). */

 * "calls are attributed to the calling routine, not lumped on the file/Module
 * node" invariant (a mis-attributed call would leave the callable at degree 0). */
static int callables_with_outbound(cbm_store_t *store, const char *project) {
    int fn = label_with_outbound(store, project, "Function");
    int mt = label_with_outbound(store, project, "Method");
    return (fn < 0 ? 0 : fn) + (mt < 0 ? 0 : mt);
}

/* Count nodes carrying `label`. Returns -1 on query error. */
static int count_label(cbm_store_t *store, const char *project, const char *label) {