feat(tui): token metrics aggregation, plan overlay, tool reasoning, clar dismissal

#295 — include narration_llm tokens in changes-panel aggregate count
#296 — execution plan overlay (Ctrl+P in-session)
#298 — surface reasoning/CoT on tool-call turns in output view
#265 — dismiss clarification modal when answered externally (session.resumed)

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

@@ -402,7 +402,7 @@ func (m Model) changesRows(w, h int) []string {
 	t := m.theme
 	turns, toks := 0, 0
 	for _, e := range m.routerMessages[m.selectedID] {
-		if e.Role == "router" && e.Metrics != nil {
+		if (e.Role == "router" || e.Role == "narration_llm") && e.Metrics != nil {
 			turns++
 			toks += e.Metrics.TotalTokens
 		}
@@ -822,6 +822,23 @@ func (m Model) buildTranscriptRows(w int) ([]string, []int) {
 				rows = append(rows, t.span(s, t.P.Faint))
 			}
 		case "tool":
+			if e.Reasoning != "" {
+				if m.thinkingShown {
+					for _, ln := range strings.Split(strings.TrimRight(e.Reasoning, "\n"), "\n") {
+						rows = append(rows, t.span("✼ "+ln, t.P.Faint))
+					}
+				} else {
+					rows = append(rows, t.span("✼ reasoning — palette: thinking", t.P.Faint))
+				}
+			} else if m.lastReasoning != "" {
+				if m.thinkingShown {
+					for _, ln := range strings.Split(strings.TrimRight(m.lastReasoning, "\n"), "\n") {
+						rows = append(rows, t.span("✼ "+ln, t.P.Faint))
+					}
+				} else {
+					rows = append(rows, t.span("✼ reasoning — palette: thinking", t.P.Faint))
+				}
+			}
 			rows = append(rows, t.span(toolRowSummary(e.Content), t.P.Dim))
 		case "thinking":
 			// Collapsed by default to a single muted line so the reasoning trace doesn't bury