Refine Burrow owl icon source

evolution/proposals/BEP-0010-platform-services-core-and-distribution.md

@@ -138,6 +138,12 @@ production services are enabled.
   - Namespace cache setup remains the fast path for remote Bazel and local disk
     caches.
 - Use a shared Burrow owl identity across app shells:
+  - the mark uses a grounded Burrowing Owl silhouette: compact face, warm brown
+    body, small cream markings, and long pale legs visible in front of the
+    burrow rim.
+  - `design/brand/Burrow.icon` is the Icon Composer source and is intentionally
+    kept to three broad raster layers: burrow ground, owl figure, and front
+    legs.
   - `design/brand/burrow-owl-icon-master.png` is the generated raster master for
     Apple app icon outputs.
   - Apple asset catalogs derive all `AppIcon` PNG sizes from that master and