infer .inputs from routing/routing.json (restored): unblocks multiplier8x8, multiplier2x2, float16/32 add/normalize/pack/classify, and ~120 other circuits with explicit inter-gate wiring

Remove routing/ folder, add schema docs to build.py

Consolidate routing modules into single routing.py

Add packed memory routing and 16-bit addressing

Add memory circuits and CPU state layout

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Upload routing/routing.json with huggingface_hub

Upload routing/generate_routing.py with huggingface_hub