Move character slot label policy

tools/prompt_smoke.py

@@ -682,6 +682,25 @@ def smoke_category_cast_config_policy() -> None:
         == ("two women", "two women", "close affectionate couple pose", 2, 0),
         "Couple type count override for two women changed",
     )
+    label_slots = [
+        {"subject_type": "woman", "label": "auto_chain", "name": "older auto"},
+        {"subject_type": "woman", "label": "auto_chain", "name": "newer auto"},
+        {"subject_type": "man", "label": "B", "name": "explicit man"},
+    ]
+    label_map = cast_context.character_slot_label_map(label_slots)
+    _expect(
+        label_map.get("Woman A", {}).get("name") == "newer auto"
+        and label_map.get("Woman B", {}).get("name") == "older auto",
+        "Character slot auto-chain label order changed",
+    )
+    _expect(
+        label_map.get("Man B", {}).get("name") == "explicit man",
+        "Character slot explicit label mapping changed",
+    )
+    _expect(
+        pb._character_slot_label_map(label_slots) == label_map,
+        "Prompt builder character slot label map should delegate to cast_context",
+    )
 
     category_config = json.loads(pb.build_category_config_json("hardcore_pose", "Foreplay and teasing"))
     _expect(category_config.get("category") == "Hardcore sexual poses", "Category config lost hardcore category mapping")