we copy `codex-command-runner.exe` into `CODEX_HOME/.sandbox-bin/` so
that it can be executed by the sandbox user.
We also detect if that version is stale and copy a new one in if so.
This can fail when you are running multiple versions of the app - the
file in `.sandbox-bin` can look stale because it comes from another app
build.
This change allows us to have multiple versions in there for different
CLI versions, and it fallsback to a `size+mtime` hash in the filename
for dev builds that don't report a real CLI version.
iceweasel-oaiandGitHub
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