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

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

@@ -47,6 +47,35 @@ func inferCategory(t string) string {
 	}
 }
 
+// narrationLine maps a progress frame to a dim router-feed line, or "" if the
+// frame is not a narration trigger.
+func narrationLine(msg protocol.ServerMessage) string {
+	switch msg.Type {
+	case protocol.TypeStageStarted:
+		return "→ " + msg.StageID
+	case protocol.TypeStageCompleted:
+		return "✓ " + msg.StageID
+	case protocol.TypeStageFailed:
+		if msg.Reason != "" {
+			return "⚠ " + msg.StageID + ": " + msg.Reason
+		}
+		return "⚠ " + msg.StageID
+	case protocol.TypeSessionPaused:
+		return "⏸ paused"
+	case protocol.TypeSessionResumed:
+		return "▶ resumed"
+	case protocol.TypeSessionCompleted:
+		return "✓ workflow complete"
+	case protocol.TypeSessionFailed:
+		if msg.Reason != "" {
+			return "✗ workflow failed: " + msg.Reason
+		}
+		return "✗ workflow failed"
+	default:
+		return ""
+	}
+}
+
 // applyServer mutates the model for a single (non-buffered) server message.
 func (m *Model) applyServer(msg protocol.ServerMessage) {
 	debugLog("SRV type=%s session=%s reason=%s", msg.Type, msg.SessionID, msg.Reason)
@@ -55,6 +84,11 @@ func (m *Model) applyServer(msg protocol.ServerMessage) {
 	if msg.IsEventBearing() && msg.SessionID != "" {
 		m.ensureSession(msg.SessionID)
 	}
+	// Inject dim narration lines for progress frames. Runs in addition to the
+	// per-type handling below (which feeds the events panel separately).
+	if line := narrationLine(msg); line != "" {
+		m.appendRouter(msg.SessionID, RouterEntry{Role: "narration", Content: line})
+	}
 	switch msg.Type {
 	case protocol.TypeSessionAnnounced:
 		m.onSessionAnnounced(msg)
@@ -102,19 +136,16 @@ func (m *Model) applyServer(msg protocol.ServerMessage) {
 			s.Tools = nil
 			s.addEvent(msg.OccurredAt, "StageStarted", msg.StageID)
 		}
-		m.appendRouter(msg.SessionID, RouterEntry{"stage", "⟐ stage " + msg.StageID + " started"})
 	case protocol.TypeStageCompleted:
 		if s := m.session(msg.SessionID); s != nil {
 			s.CurrentStage = ""
 			s.addEvent(msg.OccurredAt, "StageCompleted", msg.StageID)
 		}
-		m.appendRouter(msg.SessionID, RouterEntry{"stage", "⟐ stage " + msg.StageID + " completed"})
 	case protocol.TypeStageFailed:
 		if s := m.session(msg.SessionID); s != nil {
 			s.CurrentStage = ""
 			s.addEvent(msg.OccurredAt, "StageFailed", msg.StageID)
 		}
-		m.appendRouter(msg.SessionID, RouterEntry{"stage", "⟐ stage " + msg.StageID + " failed"})
 	case protocol.TypeInferenceStarted:
 		if s := m.session(msg.SessionID); s != nil {
 			s.Active = true