Centralize effective artifact selection

internal/artifacts/previous_requirements.go

@@ -16,10 +16,11 @@ type PreviousArtifactRequirement struct {
 	Sources  []string
 }
 
-// CollectPreviousArtifactRequirements scans enabled Scriptorium artifacts and returns
-// deduplicated previous-session artifact requirements in deterministic order.
+// CollectPreviousArtifactRequirements scans the effective Scriptorium artifact
+// set and returns deduplicated previous-session requirements in deterministic order.
 func CollectPreviousArtifactRequirements(
 	artifactsCfg map[string]config.ScriptoriumArtifactConfig,
+	effective EffectiveArtifactSet,
 ) []PreviousArtifactRequirement {
 	if len(artifactsCfg) == 0 {
 		return nil
@@ -30,7 +31,7 @@ func CollectPreviousArtifactRequirements(
 
 	for _, artifactName := range artifactNames {
 		artifactCfg := artifactsCfg[artifactName]
-		if !artifactCfg.Enabled {
+		if !effective.Includes(artifactName) {
 			continue
 		}