The mcp package major tracks the upstream mcp major it targets; 2.0.0
was the mcp 2.0 port. The 3.0.0 release came from a cross-package bump
misclassification (feat(keycardai-oauth)! in the window majored this
package) and contains no breaking change. 3.0.0 will be yanked on PyPI
and 2.2.0 tagged from this commit.

Co-authored-by: GitHub Action <action@github.com>