yubikey-agent is a seamless ssh-agent for YubiKeys.
This is basically the same as https://github.com/FiloSottile/yubikey-agent/pull/26 but implements the automatic algo selection by checking the firmware version as you mentioned in the other PR. Yubikeys officially added support for Ed25519 keys in firmware version 5.7.0. Upstream piv-go added support for it in https://github.com/go-piv/piv-go/pull/157 (released in `v2.2.0`). Note that Yubikey firmware 5.4.0 (technically 5.4.2 but I used the same version check as piv-go, see [this comment](https://github.com/go-piv/piv-go/pull/149#discussion_r1673855700)) added support for AES management keys so I also used the same firmware version detection method to upgrade the management key to AES256. Tested locally on macOS Sequoia with Yubikey firmware 5.7.1
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