Function handle_layout

src/ui/http_server.c:1495–1746

}

static void handle_layout(cbm_http_conn_t *c, const cbm_http_req_t *req) {
    char project[256] = {0};
    char max_str[32] = {0};
    char graph_str[32] = {0};

    if (!cbm_http_query_param(req->query, "project", project, (int)sizeof(project)) ||
        project[0] == '\0') {
        cbm_http_replyf(c, 400, g_cors_json, "{\"error\":\"missing project parameter\"}");
        return;
    }

    int max_nodes = 0; /* 0 → layout default budget */
    if (cbm_http_query_param(req->query, "max_nodes", max_str, (int)sizeof(max_str))) {
        int v = atoi(max_str);
        if (v > 0)
            max_nodes = v;
    }

    /* graph=missed (#963): lay out the derived miss graph (shadow project
     * "<name>::missed" inside the SAME db file) instead of the code graph —
     * only files the indexer could not fully cover, as their file structure.
     * The db file still resolves from the validated base project name. */
    bool missed_graph = false;
    if (cbm_http_query_param(req->query, "graph", graph_str, (int)sizeof(graph_str))) {
        missed_graph = strcmp(graph_str, "missed") == 0;
    }
    char scoped_project[320];
    if (missed_graph) {
        cbm_store_coverage_shadow_project(scoped_project, sizeof(scoped_project), project);
    } else {
        snprintf(scoped_project, sizeof(scoped_project), "%s", project);
    }

    char db_path[1024];
    db_path_for_project(project, db_path, sizeof(db_path));

    if (!cbm_file_exists(db_path)) {
        cbm_http_replyf(c, 404, g_cors_json, "{\"error\":\"project not found\"}");
        return;
    }

    cbm_store_t *store = cbm_store_open_path_query(db_path);
    if (!store) {
        cbm_http_replyf(c, 500, g_cors_json, "{\"error\":\"cannot open store\"}");
        return;
    }

    cbm_layout_result_t *layout =
        cbm_layout_compute(store, scoped_project, CBM_LAYOUT_OVERVIEW, NULL, 0, max_nodes);

    /* Find linked projects from CROSS_* edges. Keep `store` open through the
     * linked-projects loop below so we can resolve target Route QNs against
     * the linked stores when populating cross_edges. */
    char *linked[LAYOUT_MAX_LINKED];
    int linked_count = find_cross_repo_targets(store, project, linked, LAYOUT_MAX_LINKED);

    if (!layout) {
        cbm_store_close(store);