refactor(shell): simplify zsh profile startup
Summary: - Move reusable PATH setup into a shared .pathrc and source it from zsh login and interactive startup. - Keep .zshenv minimal, and guard p10k, Oh My Zsh, and terminal-only setup so non-terminal shells stay quiet. - Preserve Emacs vterm p10k support while skipping prompt-heavy setup in eshell-style sessions. Rationale: - The local profile had startup-time side effects, duplicate PATH/plugin setup, and non-terminal noise similar to the cleanup already done on dabel. - Neutral helper names avoid personal prefixes in reusable profile code. Tests: - zsh -n ~/.zshenv ~/.zprofile ~/.zshrc ~/.pathrc - zsh -lic 'print ok' - INSIDE_EMACS=eshell TERM=dumb zsh -ic 'print ok; print theme=$ZSH_THEME' - INSIDE_EMACS=vterm TERM=xterm-256color zsh -ic 'print ok; print theme=$ZSH_THEME' - SSH_AUTH_SOCK=/tmp/test-sock zsh -lc 'printf "%s\n" "$SSH_AUTH_SOCK"' Co-authored-by: Codex <codex@openai.com>
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