Unreleased#

Features#

#940: Added shared validation for packaged agent skills and the skills:check Nox session.
#938: Added the skills:install Nox session for installing the packaged PTB agent skill.
#942: Added api-contract-audit skill for identifying mismatches between type annotations, docstrings, and runtime behavior

#924: Removed the deprecated lint:dependencies Nox session and its unused implementation and tests.