feat(stats): record api-resolved model id in turn-stats

hive-ag3nt/src/serve_common.rs

@@ -52,6 +52,12 @@ pub fn build_row(
     open_threads_count: Option<u64>,
     open_reminders_count: Option<u64>,
 ) -> TurnStatRow {
+    // Prefer the API-resolved model id (e.g. `claude-opus-4-8`) captured
+    // from this turn's assistant events over the requested `--model`
+    // name/alias, so the model-mix + cost rollup label the concrete
+    // version that ran. Falls back to the requested name on a degenerate
+    // turn that produced no assistant event.
+    let model = bus.last_resolved_model().unwrap_or(model);
     let cost = bus.last_cost_usage().unwrap_or_default();
     let ctx = bus.last_ctx_usage().unwrap_or(cost);
     let tool_calls = bus.take_tool_calls();