experiment: improve investigation rhythm

docs/design-evolution-log.md

@@ -409,11 +409,42 @@ The response component should therefore communicate the same expected effort as
 - Does the workspace become visually calmer?
 - Does the current investigation remain the dominant focus?
 
-#### Status
+#### Result
 
-Experimental.
+Confirmed.
 
-No conclusions yet.
+Consistent interaction patterns reduce cognitive effort.
+
+Users should not have to learn different behaviours between the landing page and investigation.
+
+Smaller response areas reinforce concise observations.
+
+The engine appears more conversational when each answer feels lightweight.
+
+Consistency is becoming a stronger design tool than decoration.
+
+#### Decision
+
+Retain consistent input sizing across both contexts.
+
+---
+
+## Emerging Direction
+
+The first UX experiments focused on workspace structure.
+
+The next series will focus on investigation rhythm.
+
+Future experiments should explore:
+
+- how conversations unfold
+- how understanding evolves
+- how transitions feel
+- how confidence is gradually built
+
+The objective is no longer to arrange cards.
+
+The objective is to make the investigation feel like a natural facilitated conversation.
 
 ---