learn 2.1.0
- Add Windows x64 MCPB and ZIP packages with a bundled runtime, scoped skills and qualified local stdio workflows.
- Require clean exact-tag source, versions ending in .0, payload hashes and matching same-release artifacts; refuse changed release reruns.
- Preserve the graded-assessment halt and CLI-only live course actuation; validate assessment outcomes rather than field-name substrings.
All notable changes to learn. Versions follow semantic versioning; each minor release was built
behind the feat/learning-loop branch and reviewed before merge.