Extract role graph route policy

docs/prompt-architecture-improvement-plan.md

@@ -199,6 +199,10 @@ Already isolated:
   safe formatting, configured-cast descriptor insertion, and POV directive
   insertion live in `row_rendering.py`; `prompt_builder.py` keeps public
   delegate wrappers.
+- row role-graph route sequencing lives in `row_role_graph.py`, covering
+  hardcore source role graph construction, pose-category environment-anchor
+  cleanup, and POV role-graph rewriting before prompt axes and formatter
+  metadata consume the graph.
 - row expression text cleanup, expression route resolution, expression
   intensity weighting, character-slot/cast expression override resolution, and
   per-character expression picking plus action-aware character-expression
@@ -209,8 +213,8 @@ Already isolated:
   policy, position-key detection, category filtering, and item-template/axis
   filtering live in `hardcore_position_config.py`.
 - hardcore configured-cast role graph generation lives in
-  `hardcore_role_graphs.py`; `prompt_builder.py` selects item/axis metadata and
-  then asks that module for the source role graph.
+  `hardcore_role_graphs.py`; row generation reaches it through
+  `row_role_graph.py` after item/axis metadata is selected.
 - fallback role graph wording lives in `hardcore_role_fallback.py`, covering
   solo rows, women-only rows, men-only rows, mixed group fallbacks, and support
   partner sentences.