Centralize helper seed selection

node_route_config.py

@@ -13,6 +13,7 @@ try:
     from .prompt_builder import (
         subcategory_choices,
     )
+    from .seed_config import configured_seed_from_axes
     from .location_config import (
         build_composition_pool_json,
         build_location_pool_json,
@@ -31,6 +32,7 @@ except ImportError:  # Allows local smoke tests from the repository root.
     from prompt_builder import (
         subcategory_choices,
     )
+    from seed_config import configured_seed_from_axes
     from location_config import (
         build_composition_pool_json,
         build_location_pool_json,
@@ -224,25 +226,11 @@ class SxCPCastBias:
 
     @staticmethod
     def _configured_cast_seed(seed_config):
-        if not seed_config:
-            return None
-        if isinstance(seed_config, dict):
-            raw = seed_config
-        else:
-            try:
-                raw = json.loads(str(seed_config))
-            except (TypeError, ValueError, json.JSONDecodeError):
-                return None
-        if not isinstance(raw, dict):
-            return None
-        for key in ("category_seed", "content_seed", "role_seed", "seed", "global_seed"):
-            try:
-                value = int(raw.get(key))
-            except (TypeError, ValueError):
-                continue
-            if value >= 0:
-                return value
-        return None
+        return configured_seed_from_axes(
+            seed_config,
+            ("category", "content", "role"),
+            extra_keys=("seed", "global_seed"),
+        )
 
     @staticmethod
     def _weight_pairs(weights_text, start_count):