Validate pair seed simulation behavior

docs/prompt-architecture-improvement-plan.md

@@ -26,6 +26,8 @@ The map audit currently sees:
 - Route simulation family coverage, so representative generated rows exercise
   every registered action and position family except documented special cases
   covered by dedicated smoke fixtures.
+- Pair seed simulation, so Insta/OF soft/hard metadata and formatter outputs
+  prove locked determinism and pose-only reroll behavior.
 
 ## Architectural Finding
 
@@ -643,6 +645,8 @@ Near-term:
   scene/camera/clothing fields.
 - Keep same-room pair continuity synchronized in both assembled prompt text and
   `hardcore_row.scene_text`; `tools/prompt_smoke.py` covers this drift case.
+- Keep pair seed behavior synchronized across soft/hard rows; the route
+  simulator now checks locked pair determinism and pose-only hard-action rerolls.
 
 Medium-term:
 

docs/prompt-pool-routing-map.md

@@ -1005,6 +1005,9 @@ issues for:
   the primary `position_key`;
 - route-family coverage for registered action and position families, excluding
   only documented special cases that have their own smoke fixtures;
+- pair seed determinism for Insta/OF metadata and formatted soft/hard outputs;
+- pair pose rerolls changing hardcore action metadata while keeping cast,
+  scene, soft outfit, and composition axes stable;
 - pose-axis rerolls changing cast/scene metadata or failing to move pose/action
   metadata.