feat: add BNN prior optimization demo page

feat: add grokking demo page with chat interface

feat: add Bayesian neural network uncertainty decomposition with Parquet caching

feat: add Gaussian Process joint distribution visualization

feat: add deep net prior pathologies visualization

refactor: rename "ASI Demos" to "Demos" and finalize CLAUDE.md

fix: make sidebar expand button transparent but clickable

feat: add function space manifold visualization for Bayesian deep learning