Extract SDXL tag policy

docs/prompt-architecture-improvement-plan.md

@@ -399,7 +399,7 @@ Keep here:
 - trigger behavior;
 - style and quality presets;
 - final style/body/quality prompt assembly;
-- nude-weight setting and explicit-tag helper policy;
+- nude-weight setting;
 - negative-prompt assembly.
 
 Already isolated:
@@ -408,8 +408,11 @@ Already isolated:
   tag extraction behind `SDXLRowTagRequest`, `SDXLPairTagRequest`,
   `SDXLTagRouteDependencies`, and `SDXLTagRoute`; `sdxl_formatter.py` keeps
   compatibility wrappers plus final style/quality/trigger assembly.
-- metadata-family tag hints from `action_family`, `position_family`, and
-  `position_keys`.
+- `sdxl_tag_policy.py` owns SDXL tag splitting, tag-key dedupe, count inference,
+  character descriptor tags, metadata-family hint tags, camera tags,
+  explicit/nude helper tags, and route dependency assembly.
+- metadata-family tag hint data from `action_family`, `position_family`, and
+  `position_keys` stays in `sdxl_presets.py` and is read by `sdxl_tag_policy.py`.
 - shared row route metadata reads from `route_metadata.py`.
 - shared formatter input parsing from `formatter_input.py`.
 - style presets, quality presets, default negative prompt, and action/position