feat: launch 3d architecture documentation portal

kanban/board.md

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+---
+title: "Board"
+description: "Use the canonical project Board to inspect delivery state."
+slug: /
+---
+
+# Open the Board
+
+The canonical steering record is the [3darch Board record](https://pages.apps.lego-cloud.eu/corp-v1/portal/projects/3darch/). Use it for governed status and portfolio navigation.
+
+This documentation area explains the project view; it does not duplicate canonical Board records.

kanban/focus.md

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+---
+title: "Focus"
+description: "Identify the current delivery focus after reviewing the Board."
+---
+
+# Current focus
+
+The team is establishing the documentation foundation and defining the browser POC that visualizes one architecture model in navigable 3D.
+
+## Exit evidence
+
+A stakeholder can open the POC, navigate the model, select an element, and explain what the view communicates.