Add archive storage path configuration

internal/artifacts/paths.go

@@ -1,6 +1,8 @@
 package artifacts
 
-import "path/filepath"
+import (
+	"path/filepath"
+)
 
 // SessionPaths contains canonical local paths for one session work directory.
 type SessionPaths struct {
@@ -23,6 +25,16 @@ func SessionWorkDir(rootDir, sessionID string) string {
 	return filepath.Join(rootDir, "work", sessionID)
 }
 
+// SessionRunWorkDir returns the campaign/session/run scoped local work directory.
+func SessionRunWorkDir(rootDir, campaign, sessionID, runID string) string {
+	return filepath.Join(rootDir, "work", campaign, sessionID, runID)
+}
+
+// SessionSpoolAudioDir returns the campaign/session/run scoped local spool audio path.
+func SessionSpoolAudioDir(spoolRoot, campaign, sessionID, runID string) string {
+	return filepath.Join(spoolRoot, campaign, sessionID, runID, "audio")
+}
+
 func buildSessionPaths(workspaceRoot, sessionID string) SessionPaths {
 	root := SessionWorkDir(workspaceRoot, sessionID)
 	transcripts := filepath.Join(root, "transcripts")