fix(hebbian): random weight init to escape zero local minimum

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

BNNBot_garage/src/hebbian.nim

@@ -1,5 +1,6 @@
 import binary_encoding
 import std/math
+import std/random
 
 const
   N_IN*  = TOTAL_BITS   # 870
@@ -31,7 +32,8 @@ type
     active*:      bool
 
 proc initHebbianNet*(): HebbianNet =
-  discard  # zero-init by default
+  for w in result.W.mitems:
+    w = rand(0.2) - 0.1
 
 proc forward*(net: HebbianNet, input: BinaryVector): OutputVector =
   for j in 0..<N_OUT: