v2.12.2: Perchance to Stream

This is a hotfix for a bug where the streamable-http transport was not recognized as a valid option in fastmcp.json configuration files, despite being supported by the CLI. This resulted in a parsing error when the CLI arguments were merged against the configuration spec.

What's Changed

Fixes 🐞

• Hotfix: restore --transport streamable http at CLI by @jlowin in #1743

Docs 📚

• Update changelog for 2.12.1 by @jlowin in #1740

Full Changelog: v2.12.1...v2.12.2