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chsh is blocked on the corp dev VM (PAM-level restriction at user- provisioning time). Drop the sudo chsh -s call from 20-zsh.sh and append a guarded `exec zsh -l` block to ~/.bashrc instead — same UX without needing infra escalation, also matches the legacy WSL setup pattern in 02-wsl-terminal-setup.md. The hand-off is guarded by `case $- in *i*)` so non-interactive bash flows (scp, rsync, cron) are unaffected, and by a ZSH_VERSION absence check to prevent re-exec loops. Main doc and README table descriptions updated to match.