refactor(shell): thin stubs with managed ~/.config/zsh tree

Split always-on PATH/env, login hooks, and interactive UX into a
managed tree under ~/.config/zsh, with never-overwrite local/ hooks.
Agents and interactive shells share one PATH owner; deploy.sh applies
the layout safely across machines.

.zprofile

@@ -0,0 +1,16 @@
+# easyzsh stub: login shells only. Not the PATH source of truth (see env/00-path.zsh).
+# Put OS/vendor login hooks in ~/.config/zsh/local/login.local.zsh.
+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
+    . "$_easyzsh_f"
+  done
+  unset _easyzsh_f
+fi
+
+if [[ -f "$EASYZSH_HOME/local/login.local.zsh" ]]; then
+  # shellcheck disable=SC1090
+  . "$EASYZSH_HOME/local/login.local.zsh"
+fi