fix: Move sigmoid activation to call site in CNN layer shader

Conv functions now return raw sum, sigmoid applied at call site.
Matches tanh pattern used for inner layers.

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

1 files changed, 1 insertions, 1 deletions

diff --git a/workspaces/main/shaders/cnn/cnn_conv5x5.wgsl b/workspaces/main/shaders/cnn/cnn_conv5x5.wgsl
index e39f6ef..9328d75 100644
--- a/workspaces/main/shaders/cnn/cnn_conv5x5.wgsl
+++ b/workspaces/main/shaders/cnn/cnn_conv5x5.wgsl
@@ -62,7 +62,7 @@ fn cnn_conv5x5_7to1(
     }
   }
 
-  return 1.0 / (1.0 + exp(-sum));
+  return sum;
 }
 
 // Source layer: 7→4 channels (vec4-optimized)