Add normalize command scaffold

internal/normalize/normalize.go

@@ -0,0 +1,19 @@
+package normalize
+
+import (
+	"context"
+	"fmt"
+
+	"gitea.maximumdirect.net/eric/seriatim/internal/config"
+)
+
+// Run validates command wiring for normalize and will later execute
+// artifact-level normalization.
+func Run(ctx context.Context, cfg config.NormalizeConfig) error {
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+
+	// TODO: Implement transcript normalization transformation.
+	return fmt.Errorf("normalize command is not implemented yet")
+}