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🛡️ **CRITICAL FIXES & PROTECTION SYSTEM** **Core Variable/Tensor Compatibility Fixes:** - Fix bias shape corruption in Adam optimizer (CIFAR-10 blocker) - Add Variable/Tensor compatibility to matmul, ReLU, Softmax, MSE Loss - Enable proper autograd support with gradient functions - Resolve broadcasting errors with variable batch sizes **Student Protection System:** - Industry-standard file protection (read-only core files) - Enhanced auto-generated warnings with prominent ASCII-art headers - Git integration (pre-commit hooks, .gitattributes) - VSCode editor protection and warnings - Runtime validation system with import hooks - Automatic protection during module exports **CLI Integration:** - New `tito system protect` command group - Protection status, validation, and health checks - Automatic protection enabled during `tito module complete` - Non-blocking validation with helpful error messages **Development Workflow:** - Updated CLAUDE.md with protection guidelines - Comprehensive validation scripts and health checks - Clean separation of source vs compiled file editing - Professional development practices enforcement **Impact:** ✅ CIFAR-10 training now works reliably with variable batch sizes ✅ Students protected from accidentally breaking core functionality ✅ Professional development workflow with industry-standard practices ✅ Comprehensive testing and validation infrastructure This enables reliable ML systems training while protecting students from common mistakes that break the Variable/Tensor compatibility.