feat(tui): show router inference metrics beside router lines

apps/tui-go/internal/app/view.go

@@ -1,6 +1,7 @@
 package app
 
 import (
+	"fmt"
 	"os"
 	"strings"
 
@@ -352,6 +353,9 @@ func (m Model) routerRows(w, h int) []string {
 			for _, ln := range wrap(e.Content, w) {
 				rows = append(rows, t.span(ln, t.P.Fg))
 			}
+			if s := metricsSuffix(e.Metrics); s != "" {
+				rows = append(rows, t.span(s, t.P.Faint))
+			}
 		case "tool":
 			rows = append(rows, t.span("· tool output ("+itoaLen(e.Content)+" chars) — ^x to view", t.P.Dim))
 		case "narration", "stage":
@@ -570,6 +574,14 @@ func itoa(n int) string {
 
 func itoaLen(s string) string { return itoa(len(s)) }
 
+// metricsSuffix formats the faint latency+token annotation for a ROUTER turn.
+func metricsSuffix(mtr *TurnMetrics) string {
+	if mtr == nil {
+		return ""
+	}
+	return fmt.Sprintf("  %.1fs · %d tokens", float64(mtr.LatencyMs)/1000.0, mtr.TotalTokens)
+}
+
 // wrap splits s into lines no wider than w (rune-based, whitespace-greedy).
 func wrap(s string, w int) []string {
 	if w < 1 {