//! Vector Unit Tests - Shattered for Maintainability
//!
//! Test modules:
//! - `core` - Basic construction and core operations
//! - `minmax` - minimum(), maximum(), neg() tests
//! - `stats` - Statistical operations (mean, variance, stddev, etc.)
//! - `normalize` - Normalization tests (zscore, minmax, layer_norm)
//! - `activation` - Activation function tests (softmax, swish, mish, etc.)