fix: update shell local symlink path to packages/shell

[brfid]

Summary

• Updates the ln -sfn path in scripts/setup-dotfiles.sh from $DOTFILES/shell/... to $DOTFILES/packages/shell/...
• .stowrc now includes --dir=packages, so stow resolves automatically from there; the manual symlink path needed to match

Test plan

• Run scripts/setup-dotfiles.sh on a fresh edcloud machine and verify the symlink at ~/.config/shell/local points to the correct file

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Updates the edcloud dotfiles bootstrap script to match a changed dotfiles repo layout where the shell stow package now lives under packages/shell.

Changes:

• Update the hard-coded ln -sfn source path for the profile-specific shell local file to "$DOTFILES/packages/shell/...".

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[Copilot]

ln -sfn will happily create/update ~/.config/shell/local even if the source file path is wrong or missing, leaving a broken symlink while the script still prints success. Since this path just changed (and depends on the external dotfiles repo layout), add an explicit check that the source file exists (and fail with a clear error) before running ln, optionally with a fallback to the previous location if you need to support older dotfiles checkouts.

Suggested change

	ln -sfn "$DOTFILES/packages/shell/.config/shell/local.d/edcloud.sh" \
	"$HOME/.config/shell/local"
	LOCAL_SRC="$DOTFILES/packages/shell/.config/shell/local.d/edcloud.sh"
	if [ ! -f "$LOCAL_SRC" ]; then
	echo "Error: expected shell local config not found at: $LOCAL_SRC"
	echo "Ensure your dotfiles repo is up to date and the edcloud profile file exists."
	exit 1
	fi
	mkdir -p "$HOME/.config/shell"
	ln -sfn "$LOCAL_SRC" "$HOME/.config/shell/local"