refactor(shell): collapse managed tree back into stubs

Drop ~/.config/zsh/{env,interactive,login} modules. PATH and local.zsh
live in .zshenv; interactive UX is a single .zshrc again. Deploy only
installs the three stubs and removes obsolete trees/examples.

.zprofile

@@ -1,11 +1,3 @@
-# easyzsh stub: login shells only. Not the PATH source of truth (see env/00-path.zsh).
-# Machine-local overrides live in ~/.config/zsh/local.zsh (loaded from .zshenv).
-EASYZSH_HOME="${XDG_CONFIG_HOME:-$HOME/.config}/zsh"
-
-if [[ -d "$EASYZSH_HOME/login" ]]; then
-  for _easyzsh_f in "$EASYZSH_HOME/login"/*.zsh(N); do
-    # shellcheck disable=SC1090
-    . "$_easyzsh_f"
-  done
-  unset _easyzsh_f
-fi
+# Login shell hook. easyzsh keeps PATH and machine-local env in ~/.zshenv
+# (via ~/.config/zsh/local.zsh). Leave this file empty unless a tool insists
+# on writing login-only hooks here — prefer moving those into local.zsh.