~/.bashrc was only appended to when it already existed, so on an account without
one — a fresh container, a minimal image — `bash -i`, which is what most Linux
terminal emulators start, did not see the toolchain even though every other
shell did.
.bashrc is now created when missing. Unlike .bash_profile, whose existence stops
bash reading ~/.profile, a .bashrc that only sources the env file changes nothing
else about how bash starts.
Verified across zsh -i, zsh -c, bash -l, bash -i, sh -l and dash -l on a staged
HOME: all six resolve ludic, a second run writes nothing, and .bash_profile is
still never created.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
