Misata v0.6.1 — Docs refresh, Colab notebook, Production/Stable

Changed

Bump Development Status classifier to Production/Stable
Add Testing::Mocking and Utilities PyPI classifiers

Documentation

Rewrote all 5 docs/ pages with working one-liner API and real output numbers
Rewrote QUICKSTART.md to use misata.generate() / misata.parse() / misata.generate_from_schema()
Added Colab quickstart notebook (notebooks/quickstart.ipynb) with matplotlib charts
Added Colab badge to README
Added "Run the examples" section to README