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/architectures/gpt/generation.rs

@@ -6,8 +6,7 @@ use rtx_tensor::Tensor;
 use std::collections::HashMap;
 
 /// Position encoding type for GPT
-#[derive(Debug, Clone, Copy, PartialEq)]
-#[derive(Default)]
+#[derive(Debug, Clone, Copy, PartialEq, Default)]
 pub enum PositionEncodingType {
     /// Sinusoidal position encoding
     Sinusoidal,
@@ -18,10 +17,8 @@ pub enum PositionEncodingType {
     Rotary,
 }
 
-
 /// Sampling strategy for text generation
-#[derive(Debug, Clone, Copy, PartialEq)]
-#[derive(Default)]
+#[derive(Debug, Clone, Copy, PartialEq, Default)]
 pub enum SamplingStrategy {
     /// Greedy decoding - always pick highest probability token
     #[default]
@@ -38,7 +35,6 @@ pub enum SamplingStrategy {
     },
 }
 
-
 /// Configuration for text generation
 #[derive(Debug, Clone)]
 pub struct GenerationConfig {
@@ -102,7 +98,7 @@ pub struct TextGenerator {
 
 impl TextGenerator {
     /// Create a new text generator
-    #[must_use] 
+    #[must_use]
     pub fn new(
         vocab_to_id: HashMap<String, usize>,
         special_tokens: HashMap<String, usize>,