feat: git clone private repository inside Kaggle notebook with GH_TOKEN secret support

fix: match Kaggle kernel title to the slug to prevent SaveKernel 409 conflict

feat: upgrade kaggle bootstrap notebook with gpu checks, secrets verification, and all dependencies installation

refactor: change Kaggle deploy kernel_type to notebook with ipynb

chore: specify kaggle target username and slug in deployment flow

feat: adding full working local ETL Pipeline