Add archive promotion locks

internal/config/config.go

@@ -95,6 +95,7 @@ type ArchiveConfig struct {
 	Enabled          *bool                  `yaml:"enabled"`
 	UploadRun        *bool                  `yaml:"upload_run"`
 	PromoteArtifacts []ArchivePromotionRule `yaml:"promote_artifacts"`
+	Locks            []ArchiveLockRule      `yaml:"locks"`
 }
 
 // ArchivePromotionRule configures one artifact promotion mapping.
@@ -104,6 +105,13 @@ type ArchivePromotionRule struct {
 	Required *bool  `yaml:"required"`
 }
 
+// ArchiveLockRule prevents one source-based promotion from overwriting its
+// top-level archive destination.
+type ArchiveLockRule struct {
+	Source string `yaml:"source"`
+	Reason string `yaml:"reason"`
+}
+
 // WhisperXConfig configures WhisperX adapter settings.
 type WhisperXConfig struct {
 	TranscribeURL string `yaml:"transcribe_url"`