Unify session-aware CLI parsing and add session-id compatibility

internal/app/clean.go

@@ -16,7 +16,6 @@ import (
 // Clean removes local workspace/spool state while preserving durable cache
 // state unless cache cleanup is explicitly requested.
 func Clean(ctx context.Context, args []string, out io.Writer) error {
-	positionalSessionID, args := pullLeadingSessionID(args)
 	fs := flag.NewFlagSet("clean", flag.ContinueOnError)
 	fs.SetOutput(io.Discard)
 	var flags commonConfigFlags
@@ -27,20 +26,8 @@ func Clean(ctx context.Context, args []string, out io.Writer) error {
 	fs.BoolVar(&all, "all", false, "clean all local session work/spool state")
 	fs.BoolVar(&dryRun, "dry-run", false, "print cleanup targets without deleting")
 	fs.BoolVar(&clearCache, "clear-cache", false, "also clear durable S3 audio cache entries")
-	if err := fs.Parse(args); err != nil {
-		return fmt.Errorf("clean: invalid flags: %w", err)
-	}
-	if positionalSessionID == "" {
-		if err := applyParsedSessionIDArg("clean", fs, &flags.sessionID); err != nil {
-			return err
-		}
-	} else {
-		if fs.NArg() != 0 {
-			return fmt.Errorf("clean: unexpected positional arguments")
-		}
-		if err := applyPositionalSessionID("clean", positionalSessionID, &flags.sessionID); err != nil {
-			return err
-		}
+	if err := parseSessionAwareFlags("clean", fs, args, &flags.sessionID); err != nil {
+		return err
 	}
 	if all {
 		return cleanAllLocal(flags, dryRun, clearCache, out)