feat(tui): default auto-title on and re-derive it on resume

examples/tui-agent/tests/tui.snapshot.ts

@@ -259,6 +259,9 @@ async function runScenario(scenario: Scenario): Promise<ScenarioResult> {
       color: true,
       showReasoning: true,
       title: 'DSH TUI snapshot',
+      // Off so replay stays deterministic: an auto-title request is not among the
+      // recorded turns. Auto-title's PTY coverage lives in the keyless smoke.
+      autoTitle: false,
       welcome: `Recorded replay: ${scenario.name}`,
       maxToolOutputLines: 8,
     }, {