The previous implementation wasn't quite working. This revision reworks
it in a few ways:
- Fix various syntax issues
- Redirect the `ssh` command to our 'ssh-integration' function
- Locate the `ghostty` binary using $GHOSTTY_BIN_DIR
- Use os:temp-dir to create our temporary directory
Also, consistently use 2-space indents, which is the Elvish standard.
Xcode 16 introduces support for EditorConfig-based editor settings. Many
other editors also support EditorConfig.
In particular, this enables trailing whitespace trimming for Swift
source files.
We're consistently using 2-space indentation in our shell scripts with
the exception of bash-prefix.sh, which is a vendored script uses 4-space
indentation (https://github.com/rcaloras/bash-preexec).
Add editorconfig rules to help maintain this consistency going forward.
