188 stack transformer blocks

[thejhh]

Changes

• Implemented transformer block stacking functionality in the BitNet model
• Added final normalization layer with proper weight handling
• Enhanced tensor operations with improved thread safety and memory management
• Added comprehensive documentation for tensor package
• Improved error handling and validation in tensor operations
• Added new tensor operations: Transpose, Repeat, and Add
• Optimized memory allocations and parallel processing in BitLinear operation
• Added debug logging for better observability

Test Coverage

• Current coverage: 88.9%
• Coverage changes: 88.6% → 88.9%

Areas for Improvement

High Priority

• Optimize memory allocations in model operations (TODO Parallelize with Goroutines #191)
• Implement proper output projection and token prediction (TODO Final Output Layer (LM Head) #189)

Medium Priority

• Improve error handling in model operations (TODO Testing & Performance Tuning #192)
• Add more comprehensive benchmarks (TODO Testing & Performance Tuning #192)
• Enhance documentation for model operations

Low Priority

• Consider SIMD optimizations (TODO Parallelize with Goroutines #191)
• Add more model operations (TODO Token Decoding (Inference Loop) #190)
• Improve test organization (TODO Testing & Performance Tuning #192)

Implementation Details

• Added final normalization layer with proper weight conversion from int8 to float32
• Enhanced tensor operations with improved thread safety using mutex locks
• Implemented efficient parallel processing in BitLinear operation
• Added comprehensive documentation for tensor package and its operations
• Improved error handling with proper validation and panic messages
• Added new tensor operations for better flexibility in model operations

Closes #188