Guard oh-my-zsh source with directory existence check#87
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On a fresh clone before `make install`, $ZSH (~/.oh-my-zsh) does not exist yet. The bare `source` caused every interactive shell to fail fatally. Wrapping with `[ -d "$ZSH" ]` makes the shell usable even before oh-my-zsh is installed. Closes #74
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Summary
source $ZSH/oh-my-zsh.shatfiles/zsh/zshrc:15had no existence guard.make install,$ZSH(~/.oh-my-zsh) does not exist yet, so every interactive shell opened immediately fails fatally.[ -d "$ZSH" ] && source "$ZSH/oh-my-zsh.sh", consistent with the defensive pattern already used throughout the file.Test plan
make install: verify opening a shell no longer failsmake lint— no new failures vs. baselineCloses #74
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