Support ?family= deep links (model cards link to their own family)

app.js

@@ -380,6 +380,15 @@ legendGrid.innerHTML = config.metrics.map(m =>
 // ─── State ────────────────────────────────────────────────────────────────────
 
 const filters = { baseFamily: BASE_FAMILY_KEYS[0] || "", variant: null };
+// Deep link: ?family=<config family key> selects that family on load
+// (e.g. model cards link their benchmark charts to their own family).
+{
+    const requested = new URLSearchParams(location.search).get("family");
+    if (requested && config.model_families?.[requested]) {
+        filters.baseFamily = deriveBaseFamily(requested);
+        if (requested !== filters.baseFamily) filters.variant = requested;
+    }
+}
 config.filters.forEach(f => { filters[f.column] = ""; });
 filters.metric = CHART_CFG.default_metric || config.metrics[0]?.column || "";