refactor(shell): stop managing ~/.zprofile

Always-on and machine hooks already live in .zshenv / local.zsh.
Drop the empty stub, remove it on deploy, and leave real .zprofile
files to optional migration into local.zsh only.

tests/installers.sh

@@ -81,10 +81,11 @@ for script in "$ROOT"/*.sh; do
     bash -n "$script"
 done
 
-for config in "$ROOT/.zshenv" "$ROOT/.zshrc" "$ROOT/.zprofile" "$ROOT"/zshrc/*.zsh; do
+for config in "$ROOT/.zshenv" "$ROOT/.zshrc" "$ROOT"/zshrc/*.zsh; do
     [[ -f "$config" ]] || continue
     zsh -n "$config"
 done
+[[ ! -e "$ROOT/.zprofile" ]] || fail "easyzsh should not ship a managed .zprofile"
 
 grep -q 'NVM_VERSION="v0.40.4"' "$ROOT/install_nvm.sh" || fail "nvm version is stale"
 grep -q 'apt-get install -y unzip' "$ROOT/install_fnm.sh" || fail "Ubuntu unzip installation is missing"