Function breadth_diag

tests/test_lang_contract.c:525–547

On a breadth failure, explain WHY: does direct extraction (no pipeline, no * timeout) yield defs, and what node labels did the pipeline actually create for * the file? Distinguishes "extraction itself broke" from "extraction works but * the def didn't reach the graph / got an unexpected label". */

 * the file? Distinguishes "extraction itself broke" from "extraction works but
 * the def didn't reach the graph / got an unexpected label". */
static void breadth_diag(cbm_store_t *store, const char *project, const char *rel,
                         const GrammarCase *c) {
    CBMFileResult *dr =
        cbm_extract_file(c->src, (int)strlen(c->src), c->lang, "lc", c->path, 0, NULL, NULL);
    int direct = dr ? dr->defs.count : -1;
    const char *direct_label = (dr && dr->defs.count > 0) ? dr->defs.items[0].label : "-";
    char labels[256] = {0};
    cbm_node_t *nodes = NULL;
    int count = 0;
    if (cbm_store_find_nodes_by_file(store, project, rel, &nodes, &count) == CBM_STORE_OK) {
        for (int i = 0; i < count && strlen(labels) < sizeof(labels) - 40; i++) {
            char one[48];
            snprintf(one, sizeof(one), "%s ", nodes[i].label ? nodes[i].label : "?");
            strncat(labels, one, sizeof(labels) - strlen(labels) - 1);
        }
    }
    cbm_store_free_nodes(nodes, count);
    fprintf(stderr, "      └─ direct_extract_defs=%d (label0=%s)  graph_labels=[%s]\n", direct,
            direct_label ? direct_label : "(null)", labels);
    if (dr) {
        cbm_free_result(dr);
    }
}

TEST(contract_all_grammars_in_graph) {
    int n = (int)CBM_GRAMMAR_CASES_COUNT;