Terminalize handled invocation failures

internal/manifest/manifest.go

@@ -121,6 +121,15 @@ func (m *Manifest) MarkStageFailed(name string, at time.Time, message string) {
 	m.UpdatedAt = at
 }
 
+// RecordFailure records an invocation failure without changing session progress.
+func (m *Manifest) RecordFailure(at time.Time, message string) {
+	if m == nil {
+		return
+	}
+	m.LastError = &ErrorRecord{Message: strings.TrimSpace(message), At: timePtr(at)}
+	m.UpdatedAt = at
+}
+
 // MarkStageSkipped marks a stage as skipped and records the skip reason.
 func (m *Manifest) MarkStageSkipped(name string, at time.Time, reason string) {
 	s := m.ensureStage(name, at)