Centralize artifact source and publish destination policy

internal/artifacts/catalog.go

@@ -4,6 +4,8 @@ import (
 	"fmt"
 	"sort"
 	"strings"
+
+	"gitea.maximumdirect.net/eric/narratio/internal/artifactpolicy"
 )
 
 const (
@@ -47,7 +49,7 @@ func NewArtifactCatalog() *ArtifactCatalog {
 
 // ConfiguredArtifactSourceID converts a configured artifact key into canonical source ID.
 func ConfiguredArtifactSourceID(key string) string {
-	return "narratio.artifact." + strings.TrimSpace(key)
+	return artifactpolicy.ConfiguredSourceID(key)
 }
 
 // RegisterBuiltIns registers built-in source definitions used by runtime artifact resolution.