Module spatial_backend 

Unified spatial index backend trait (ADR-056 §8 / WEFT-718).

Mirrors crate::vector_backend::VectorBackend conventions: epoch versioning, backend_name, Send + Sync for Arc sharing. Compiled only when the ecc feature is enabled.

Enums

SpatialBackendKind

Which spatial backend to construct (from config).

SpatialError

Errors from spatial backend operations.

Traits

SpatialBackend

Unified spatial index backend interface (ADR-056 §8).

Type Aliases

SpatialResult

Result alias for spatial backend operations.