style: apply rustfmt across all crates and demos

Consistent formatting pass: line wrapping, import sorting, trailing
whitespace removal, let-chain indentation, merged derive attributes,
and unsafe block reformatting.

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

crates/training/rtx-transformers/src/layers/metal_moe.rs

@@ -73,7 +73,7 @@ impl Default for MetalMoEConfig {
 
 impl MetalMoEConfig {
     /// Create a new Metal `MoE` configuration
-    #[must_use] 
+    #[must_use]
     pub fn new(
         num_experts: usize,
         top_k: usize,
@@ -116,7 +116,7 @@ impl MetalMoEConfig {
     }
 
     /// Calculate expert capacity for given batch
-    #[must_use] 
+    #[must_use]
     pub fn calculate_capacity(&self, batch_size: usize, seq_len: usize) -> usize {
         let total_tokens = batch_size * seq_len;
         let base_capacity = ((total_tokens as f32 * self.capacity_factor) / self.num_experts as f32)
@@ -205,7 +205,7 @@ impl MetalExpert {
     }
 
     /// Get parameters
-    #[must_use] 
+    #[must_use]
     pub fn parameters(&self) -> Vec<&Tensor> {
         let mut params = vec![&self.up_weight, &self.down_weight];
         if let Some(ref b) = self.up_bias {
@@ -373,7 +373,7 @@ impl MetalRouter {
     }
 
     /// Get parameters
-    #[must_use] 
+    #[must_use]
     pub fn parameters(&self) -> Vec<&Tensor> {
         let mut params = vec![&self.gate_weight];
         if let Some(ref b) = self.gate_bias {
@@ -547,31 +547,31 @@ impl MetalMoE {
     }
 
     /// Get configuration
-    #[must_use] 
+    #[must_use]
     pub fn config(&self) -> &MetalMoEConfig {
         &self.config
     }
 
     /// Get router
-    #[must_use] 
+    #[must_use]
     pub fn router(&self) -> &MetalRouter {
         &self.router
     }
 
     /// Get experts
-    #[must_use] 
+    #[must_use]
     pub fn experts(&self) -> &[MetalExpert] {
         &self.experts
     }
 
     /// Check if Metal acceleration is active
-    #[must_use] 
+    #[must_use]
     pub fn is_metal_active(&self) -> bool {
         self.metal_active
     }
 
     /// Get total parameter count
-    #[must_use] 
+    #[must_use]
     pub fn parameter_count(&self) -> usize {
         let router_params = self.config.hidden_dim * self.config.num_experts
             + if self.config.bias {