fix: replace deprecated gr.update() with gr.Dropdown() for Gradio 5.x

fix: match neuron model names to N2 paper specs

fix: correct N2 learning opcodes (18→14) in comparison table and data

fix: add N2 paper Zenodo link

feat: rebuild as N1/N2 processor configurator

Fix: pin gradio 5.12.0 + Python 3.12 for HfFolder compatibility

Pin Python 3.12 to fix audioop removal in 3.13

Fix Gradio version: 4.0 -> 4.44.1

Initial HF Space: Catalyst Cloud demo