GraphSpec Primitive Packs

This umbrella re-exports the non-core GraphSpec primitive packs.

GraphSpec primitives are operation adapters, not models:

• a primitive wraps one reusable operation, such as convolution or pooling;
• a model composes primitives into an architecture, such as twoConvCnn or residualLinear.

The small always-available primitives (linear, relu, softmax) live in NN.GraphSpec.Core because they are part of the minimal sequential DSL examples and lowering interface. Larger domain-specific packs live under NN.GraphSpec.Primitives/* so the core language does not turn into a catalog of every layer TorchLean supports.

Current extension pack:

• NN.GraphSpec.Primitives.Spatial: rank-polymorphic convolution, pooling, flattening, normalization, and global-average-pooling adapters.

Adding a new operation to GraphSpec means giving it both meanings:

• pure Spec semantics for proof/reference use;
• TorchLean program semantics for execution/training.