Shorter messages when connector downloads are refused because of git

Connectors can save downloaded files into a connector-downloads folder. When that folder holds files tracked by git (the version control tool), Claude Code refuses the save so the file is not accidentally committed. The refusal message no longer includes the note "at the top of this git repository, or where Claude Code was started outside one". It now reads: "the connector-downloads folder holds files that git tracks, so a saved file could be committed".