Clear superseded session stage result details

internal/manifest/manifest.go

@@ -88,6 +88,7 @@ func New(sessionID string, now time.Time) *Manifest {
 // MarkStageRunning marks a stage as running and updates timestamps.
 func (m *Manifest) MarkStageRunning(name string, at time.Time) {
 	s := m.ensureStage(name, at)
+	s.clearResultDetails()
 	s.Status = StatusRunning
 	s.StartedAt = timePtr(at)
 	s.CompletedAt = nil
@@ -110,6 +111,7 @@ func (m *Manifest) MarkStageSucceeded(name string, at time.Time, outputs []Artif
 // MarkStageFailed marks a stage as failed and records error metadata.
 func (m *Manifest) MarkStageFailed(name string, at time.Time, message string) {
 	s := m.ensureStage(name, at)
+	s.clearResultDetails()
 	s.Status = StatusFailed
 	s.CompletedAt = timePtr(at)
 	s.Error = &ErrorRecord{Message: strings.TrimSpace(message), At: timePtr(at)}
@@ -121,10 +123,10 @@ func (m *Manifest) MarkStageFailed(name string, at time.Time, message string) {
 // 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)
+	s.clearResultDetails()
 	s.Status = StatusSkipped
 	s.CompletedAt = timePtr(at)
 	s.Error = &ErrorRecord{Message: strings.TrimSpace(reason), Code: "skipped", At: timePtr(at)}
-	s.Outputs = nil
 	s.UpdatedAt = at
 	m.UpdatedAt = at
 }
@@ -138,6 +140,13 @@ func (m *Manifest) MarkStageStale(name string, at time.Time, reason string) {
 	m.UpdatedAt = at
 }
 
+func (s *StageRecord) clearResultDetails() {
+	s.Outputs = nil
+	s.Logs = nil
+	s.GeneratedConfigs = nil
+	s.Metadata = nil
+}
+
 func (m *Manifest) ensureStage(name string, at time.Time) *StageRecord {
 	if m.Stages == nil {
 		m.Stages = map[string]*StageRecord{}