Extract Krea pair formatter route

docs/prompt-architecture-improvement-plan.md

@@ -329,12 +329,16 @@ Owner: `krea_formatter.py`.
 Keep here:
 
 - Krea prose style;
-- Krea route orchestration;
+- Krea top-level route orchestration;
 - camera-scene preservation;
 - fallback text parsing.
 
 Already isolated:
 
+- `krea_pair_formatter.py` owns Insta/OF pair soft/hard Krea prose assembly
+  behind `KreaPairFormatRequest`, `KreaPairFormatDependencies`, and
+  `KreaPairPrompts`; `krea_formatter.py` keeps the `_insta_pair_to_krea`
+  compatibility wrapper.
 - `krea_cast.py` owns cast descriptor parsing, cast labels, cast prose, label
   joining, natural cast descriptor text, and label replacement for formatter
   routes, including the caption naturalizer's cast metadata path.