Replace the local/ directory of split env/login/interactive files with
one always-on local.zsh sourced from .zshenv. Deploy migrates old
fragments and never overwrites local.zsh.
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.
Non-interactive agent shells (Codex, Claude) skip .zshrc and never saw
user-local tools installed via pipx/uv/grok. Add ~/.local/bin in
.zshenv with an idempotent guard, and source optional
~/.config/zshenv.local for machine-local early env.
Move brew shellenv into .zshenv so PATH is available outside
interactive shells, and make install guarantee a Trash backend
for safer rm aliases on both macOS and Linux.
Jeffrey