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feat: integrate MLflow model registry, DagsHub metrics tracking, and local Grafana observability stack

feat: add DVC push step to CI, store DagsHub auth config, add dvc push to workflow

feat: initialize DVC, save churn dataset CSV, and enhance CML reporting with performance charts

fix: grant write permissions to GITHUB_TOKEN for CML job

fix: install canvas system dependencies in CML workflow

ci/cd: run CML on pushes, redirect space root to docs, and add conftest setup logs

feat(ci): configure CI, Hugging Face deploy, and CML model training workflows