Removed legacy transcript artifact aliases

internal/artifacts/artifact_resolver.go

@@ -84,12 +84,6 @@ var artifactRegistry = map[string]artifactSpec{
 	},
 }
 
-var artifactAliases = map[string]string{
-	"processed_transcript":  ArtifactTranscriptPolished,
-	"normalized_transcript": ArtifactTranscriptFull,
-	"trimmed_transcript":    ArtifactTranscriptTrimmed,
-}
-
 // ResolvedSessionArtifact describes one session-level artifact lookup result.
 type ResolvedSessionArtifact struct {
 	ID            string
@@ -113,15 +107,12 @@ func (e *SessionArtifactNotFoundError) Unwrap() error {
 	return ErrSessionArtifactNotFound
 }
 
-// NormalizeSessionArtifactSource maps legacy aliases to canonical IDs and validates IDs.
+// NormalizeSessionArtifactSource validates canonical artifact IDs.
 func NormalizeSessionArtifactSource(source string) (string, error) {
 	normalized := strings.TrimSpace(source)
 	if normalized == "" {
 		return "", fmt.Errorf("artifact source is required")
 	}
-	if alias, ok := artifactAliases[normalized]; ok {
-		normalized = alias
-	}
 	if _, ok := artifactRegistry[normalized]; !ok {
 		return "", fmt.Errorf("unsupported artifact source %q", source)
 	}