Create a claude tutorial for adding a new model to puzzletron (qwen 3.5)

[danielkorzekwa]

Create a claude tutorial for adding a new model to puzzletron (qwen 3.5).

location of the tutorial: .agents/skills/puzzletron/adding_new_model_tutorial.md

[danielkorzekwa]

@Separius puzzletron descriptor for Qwen 3.5: https://github.com/NVIDIA/Model-Optimizer/tree/anymodel_qwen3p5