dependencies: invert diagram hierarchy

Author: plebhash

DEPENDENCIES.md

@@ -28,9 +28,9 @@ All crates across these two repositories follow a well-defined dependency hierar
     'padding': 12
   }
 }}%%
-flowchart TB
+flowchart BT
   subgraph STR["stratum repo (low-level crates)"]
-    direction TB
+    direction BT
 
     subgraph STR_L0["Layer 0: foundations"]
       direction LR
@@ -75,7 +75,7 @@ flowchart TB
   end
 
   subgraph APPS["sv2-apps repo (application crates)"]
-    direction TB
+    direction BT
 
     subgraph APPS_L0["Layer A0: shared libraries"]
       direction LR