v0.1.0 — initial source release

Official MIT-licensed Python SDK, published as sendhog-sdk 0.1.0 on PyPI: https://pypi.org/project/sendhog-sdk/ . Install with python -m pip install sendhog-sdk (Python 3.11+). Native sending, stored templates, retained-message reads and SES/Postmark/Resend/SendGrid migration clients are included. Canonical source: 39eb5b3314fd39eb144f279e43e4cd78e1d0fb5e; exact contract/file provenance is in SOURCE.json. GitHub OIDC publication succeeded in https://github.com/SendHog/sdk-python/actions/runs/39136471112 after protected environment approval. Clean no-cache PyPI installation and all five client imports passed. No long-lived PyPI token used; no live email sent during release validation.