chore: update mlx-swift-lm submodule to include native STFT masks and architecture mapping

Author: Antigravity

mlx-swift-lm

@@ -1 +1 @@
-Subproject commit c923413c1ce39e6c58e1ce8ac898ffda65c3b56e
+Subproject commit 689b6ae60d3451331b079f45d897431db01c1dec

test_keys.swift

@@ -1,9 +1,7 @@
 import Foundation
 import MLX
+import MLXNN
 
-let weights = try! MLX.load(url: URL(fileURLWithPath: "/Users/simba/.cache/huggingface/hub/models--mlx-community--gemma-4-e4b-it-8bit/snapshots/18f3418f2da5426ec6e4967b4c96bdd2d0002ee4/model-00001-of-00004.safetensors"))
-for key in weights.keys {
-    if key.contains("per_layer") {
-        print(key)
-    }
-}
+MLX.GPU.set(cacheLimit: 10 * 1024 * 1024)
+let norm = RMSNorm(dimensions: 128)
+print("RMSNorm parameters:", norm.parameters().keys)