Share formatter cast descriptor policy

docs/prompt-architecture-improvement-plan.md

@@ -234,8 +234,9 @@ Keep here:
 
 Already isolated:
 
-- `krea_cast.py` owns cast descriptor parsing, cast prose, label joining, and
-  natural label replacement for formatter routes.
+- `krea_cast.py` owns cast descriptor parsing, cast labels, cast prose, label
+  joining, natural cast descriptor text, and label replacement for formatter
+  routes, including the caption naturalizer's cast metadata path.
 - `krea_clothing.py` owns clothing-state cleanup and action-aware body-access
   wording for formatter routes.
 - `krea_action_context.py` owns shared action-family predicates, axis context
@@ -302,10 +303,10 @@ Keep here:
 - style-tail policy.
 - metadata-family action labels from `action_family` and `position_family`.
 - shared formatter input parsing from `formatter_input.py`.
+- shared cast descriptor parsing and label replacement from `krea_cast.py`.
 
 Improve later:
 
-- share more metadata readers with Krea without sharing Krea prose;
 - add a `caption_profile` option for concise/dense LoRA caption styles.
 
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