Zed AI v1.6.1-pre release notes

What the release notes say

Fix crash that could occur when unsplitting a side by side diff view (#58694)
Fixed symlinked files showing the entire file as changed in the git diff/gutter. (#58679)
acp: Fix for certain ACP Registry agent downloads not starting (#58632)
Fixed high CPU usage when using Zeta in some cases (thanks @clupprich!) (#58590)
Fixed a crash that could occur while streaming agent edits containing multibyte characters. (#58451)
Fixed an issue where Zed would stop responding to file system changes in some cases (#58692