Centralize formatter target policy

caption_format_route.py

@@ -3,6 +3,11 @@ from __future__ import annotations
 from dataclasses import dataclass
 from typing import Any, Callable
 
+try:
+    from . import formatter_target as target_policy
+except ImportError:  # pragma: no cover - plain-script smoke tests
+    import formatter_target as target_policy
+
 
 @dataclass(frozen=True)
 class CaptionFormatRequest:
@@ -49,7 +54,7 @@ def naturalize_caption_result(
     deps: CaptionFormatDependencies,
 ) -> CaptionFormatRoute:
     input_hint = request.input_hint if request.input_hint in ("auto", "metadata_json", "caption_or_prompt") else "auto"
-    target = request.target if request.target in ("auto", "single", "softcore", "hardcore") else "auto"
+    target = target_policy.normalize_target(request.target)
     detail_level, style_policy, include_trigger = deps.apply_caption_profile(
         request.caption_profile,
         request.detail_level,