Integrate extraction lifecycle and resume validation

internal/app/runner.go

@@ -171,6 +171,31 @@ func executeStages(ctx context.Context, cfg *config.Config, stages []stage.Stage
 	for _, d := range decisions {
 		s := d.Stage
 		runNames = append(runNames, s.Name())
+		if d.Action == stageActionSkip && !stageSucceeded(m, s.Name()) {
+			d.Action = stageActionRun
+		}
+
+		if d.Action == stageActionSkip {
+			if validator, ok := s.(stage.ResumeValidator); ok {
+				validation, err := validator.ValidateResume(ctx, stageEnv, m)
+				if err != nil {
+					return nil, fmt.Errorf("validate resume for stage %q: %w", s.Name(), err)
+				}
+				validation = validation.Normalized()
+				if !validation.Resumable {
+					staleAt := nowUTC()
+					m.MarkStageStale(s.Name(), staleAt, validation.Reason)
+					invalidateDownstreamSucceededStagesWithReason(
+						m, s.Name(), staleAt, "upstream stage result was not resumable",
+					)
+					if err := env.ManifestStore.Save(ctx, manifestPath, m); err != nil {
+						return nil, fmt.Errorf("save manifest after resume validation for stage %q: %w", s.Name(), err)
+					}
+					env.Logger.Info("stage result is not resumable", "stage", s.Name(), "reason", validation.Reason)
+					d.Action = stageActionRun
+				}
+			}
+		}
 
 		if d.Action == stageActionSkip {
 			skipped = append(skipped, s.Name())