feat(tui): render workflow progress as dim router-feed narration lines

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

@@ -0,0 +1,49 @@
+package app
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/correx/tui-go/internal/protocol"
+)
+
+func TestTemplateNarrationAppendsDimLines(t *testing.T) {
+	m := NewModel(nil)
+	m.width, m.height = 120, 40
+	m.theme = NewTheme(SoftBlue)
+	sid := "s1"
+	m.selectedID = sid
+	m.sessionEntered = true
+	sess := Session{ID: sid, Status: "ACTIVE"}
+	m.sessions = []Session{sess}
+
+	frames := []protocol.ServerMessage{
+		{Type: protocol.TypeStageStarted, SessionID: sid, StageID: "validate"},
+		{Type: protocol.TypeStageCompleted, SessionID: sid, StageID: "validate"},
+		{Type: protocol.TypeStageFailed, SessionID: sid, StageID: "generate", Reason: "schema mismatch"},
+		{Type: protocol.TypeSessionCompleted, SessionID: sid},
+	}
+	for _, f := range frames {
+		m.applyServer(f)
+	}
+	got := m.routerMessages[sid]
+	if len(got) != 4 {
+		t.Fatalf("want 4 narration entries, got %d: %+v", len(got), got)
+	}
+	for _, e := range got {
+		if e.Role != "narration" {
+			t.Fatalf("want role=narration, got %q", e.Role)
+		}
+	}
+	if !strings.Contains(got[0].Content, "validate") || !strings.HasPrefix(got[0].Content, "→") {
+		t.Fatalf("stage.started line: %q", got[0].Content)
+	}
+	if !strings.Contains(got[2].Content, "schema mismatch") {
+		t.Fatalf("stage.failed line should carry reason: %q", got[2].Content)
+	}
+	rows := m.routerRows(80, 20)
+	joined := strings.Join(rows, "\n")
+	if strings.Contains(joined, "awaiting router response") {
+		t.Fatalf("placeholder must be gone once feed has entries")
+	}
+}