experiment: organise workspace into cognitive zones

docs/design-evolution-log.md

@@ -105,6 +105,33 @@ The document-like feeling is caused partly by the narrow outer container.
 Change:
 Increase the available desktop workspace width without rearranging any components.
 
+Result:
+Confirmed.
+
+Learning:
+Increasing the outer workspace width reduced the narrow-document feeling and made better use of large displays.
+
+Unexpected learning:
+Width alone did not create a workshop. The wider canvas exposed that the interface still behaves as a collection of independent cards, with supporting artefacts unsure how to use the available space.
+
+Decision:
+Keep the wider desktop canvas.
+
+Next question:
+Can grouping the interface into cognitive work zones make the wider canvas feel like a coherent investigation surface?
+
+### Experiment 02 — Cognitive work zones
+
+Hypothesis:
+A workspace organised around what the investigator is doing will feel more coherent than one organised around equal cards or equal columns.
+
+Change:
+Arrange existing components into three visibly related zones:
+
+1. Active work
+2. Shared understanding
+3. Reference and record
+
 Evaluation:
 Pending visual review.