Typed Graph Autograd Runtime

This is the runtime umbrella for TorchLean's typed graph execution path.

The typed graph path is the middle layer between:

• the low-level dynamic tape engine in NN.Runtime.Autograd.Engine, and
• the user-facing TorchLean session/model API in NN.Runtime.Autograd.Model.

It has two pieces:

• TypedGraph.Core: packages executable GraphData, lowers it to a tape, and exposes dense reverse-mode entry points;
• TypedGraph.GraphM: a typed builder DSL for authoring GraphData without manually threading dependent node indices.

Forward-only execution of the separate operation-tagged NN.IR.Graph representation lives under NN.Runtime.Autograd.IRExec. Its ForwardGraph stores only forward operations, so it cannot be mistaken for the differentiable typed graphs exposed here.