v1.0.0 - Stable Contracts & Finishing for the release

Goal: Declare stable contracts for workflows, steps and providers. Cleaning and finishing all open issues to get a tidy first release.

• Freeze provider/step contracts (breaking changes require v2 plan)
• Compatibility policy documented
• updated and consistent documentation and pages for entrypoint web page
• live test results incorporated and fixed (single 0.9.x releases)
• high quality pipeline process