Centralize formatter input hints

caption_format_route.py

@@ -4,8 +4,10 @@ from dataclasses import dataclass
 from typing import Any, Callable
 
 try:
+    from . import formatter_input as input_policy
     from . import formatter_target as target_policy
 except ImportError:  # pragma: no cover - plain-script smoke tests
+    import formatter_input as input_policy
     import formatter_target as target_policy
 
 
@@ -53,7 +55,7 @@ def naturalize_caption_result(
     request: CaptionFormatRequest,
     deps: CaptionFormatDependencies,
 ) -> CaptionFormatRoute:
-    input_hint = request.input_hint if request.input_hint in ("auto", "metadata_json", "caption_or_prompt") else "auto"
+    input_hint = input_policy.normalize_input_hint(request.input_hint, text_hint=input_policy.INPUT_HINT_CAPTION_OR_PROMPT)
     target = target_policy.normalize_target(request.target)
     detail_level, style_policy, include_trigger = deps.apply_caption_profile(
         request.caption_profile,