Centralize formatter target policy

docs/prompt-architecture-improvement-plan.md

@@ -82,6 +82,15 @@ routes:
 It must not make formatter-style decisions. Krea prose, SDXL tags, and training
 caption sentence shape stay in their formatter modules.
 
+Formatter target handling now has one home:
+
+- `formatter_target.py`
+
+It owns route-neutral target normalization for `auto`, `single`, `softcore`,
+and `hardcore`, including pair-side semantics. Single-output formatters select
+the softcore side for pair `auto`/`single` targets, while caption pair routing
+can still include both sides for combined training captions.
+
 Shared hardcore phrase cleanup now has one home:
 
 - `hardcore_text_cleanup.py`
@@ -345,7 +354,8 @@ Already isolated:
 
 - `krea_format_route.py` owns top-level Krea dispatch, including option
   normalization, metadata-vs-text input selection, single-vs-pair branching,
-  extra positive/negative merging, final prose hygiene, and output shape;
+  shared target normalization via `formatter_target.py`, extra
+  positive/negative merging, final prose hygiene, and output shape;
   `krea_formatter.py` keeps the public wrapper.
 - `krea_configured_cast_formatter.py` owns normal metadata configured-cast
   Krea prose assembly behind `KreaConfiguredCastRequest`,
@@ -417,9 +427,10 @@ Keep here:
 Already isolated:
 
 - `sdxl_format_route.py` owns top-level SDXL dispatch, including formatter
-  profile application, target and nude-weight normalization, metadata-vs-text
-  input selection, single-vs-pair branching, final prompt/negative output
-  shape, and fallback routing; `sdxl_formatter.py` keeps the public wrapper.
+  profile application, shared target normalization via `formatter_target.py`,
+  nude-weight normalization, metadata-vs-text input selection, single-vs-pair
+  branching, final prompt/negative output shape, and fallback routing;
+  `sdxl_formatter.py` keeps the public wrapper.
 - `sdxl_tag_routes.py` owns normal metadata row tags and Insta/OF pair soft/hard
   tag extraction behind `SDXLRowTagRequest`, `SDXLPairTagRequest`,
   `SDXLTagRouteDependencies`, and `SDXLTagRoute`; `sdxl_formatter.py` keeps
@@ -455,8 +466,9 @@ Keep here:
 Already isolated:
 
 - `caption_format_route.py` owns top-level caption dispatch, including input
-  hint normalization, caption profile application, metadata-vs-text branching,
-  trigger wrapping, final prose hygiene, and method/output shape;
+  hint normalization, shared target normalization via `formatter_target.py`,
+  caption profile application, metadata-vs-text branching, trigger wrapping,
+  final prose hygiene, and method/output shape;
   `caption_naturalizer.py` keeps the public wrapper.
 - `caption_metadata_routes.py` owns metadata row natural-language assembly for
   single, couple, configured-cast, group/layout, and Insta/OF pair routes behind