docs: add detailed inline comments to all notebooks and k8s code snippets

docs: add CLAUDE.md with project guidance

chore: update environment and configuration for MinIO integration

chore: remove learning-plan.txt, replaced by interactive roadmap

chore: update notebook metadata after local run

fix: use local MLflow tracking when running in Colab

fix: add missing pip installs and imports for Colab compatibility

fix: add missing setup.sh for ml-basics guide

feat: rewrite all notebooks with educational structure and sandbox compatibility

fix(pipeline): rebuild feature_store notebook with correct cell types

fix(pipeline): install feast into active kernel Python

fix(pipeline): rewrite feature_store notebook for HR attrition domain

chore: ignore .ipynb_checkpoints directories

docs: add .env.example copy step to local setup, remove stale venv reference

fix: remove internal network flag blocking host access to local services