gdn: add layers.py + expose layers ns (Qwen3.6 Qwen3_5{,Moe}GatedDeltaNet + Qwen3-Next GatedDeltaNet) for kernelize()

gdn: add layers.py + expose layers ns (Qwen3.6 Qwen3_5{,Moe}GatedDeltaNet + Qwen3-Next GatedDeltaNet) for kernelize()

gdn: add layers.py (Qwen3.6 Qwen3_5{,Moe}GatedDeltaNet + Qwen3-Next GatedDeltaNet) for kernelize()

Uploaded using `kernel-builder`.

initial commit