//! Spatio-temporal GNN for distributed sonobuoy / sensor arrays (KG-013 / WEFT-354).
//!
//! K-STEMIT-style dual-branch architecture adapted from ice-penetrating radar
//! (arXiv:2604.09922) to underwater acoustic sensing:
//!
//! - **Spatial**: GraphSAGE on a buoy-position graph with inverse-distance
//! (and optional propagation-delay) edge weights — learned beamforming
//! over irregular arrays.
//! - **Temporal**: Gated linear unit (GLU) convolution over per-buoy acoustic
//! time series — learned matched filtering for transients.
//! - **Physics prior**: ocean acoustic node features (SSP, thermocline, sea
//! state, current, bottom type) projected into the same hidden space.
//! - **Adaptive fusion**: learnable `α ∈ [0,1]` balances spatial vs temporal;
//! physics residual is added with a fixed scale (or learnable γ).
//! - **Classification head**: linear → logits for detection / species-style labels.
//!
//! Pure Rust, no GPU / no ndarray. Behind the `sensor` feature flag.
//!
//! Design note: [`docs/plans/weft-354-k-stemit.md`](../../../../docs/plans/weft-354-k-stemit.md).
pub use ;
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