Add ~/.local/bin to PATH from prezto-override zshrc

The Claude Code installer drops the binary at ~/.local/bin/claude.
Without this PATH entry, freshly-installed Claude Code is invisible to
new shells until the user adds it manually. Other ~/.local/bin scripts
in this dotfiles repo (tmux-ip, tmux-window-icon, twitterbot, etc.)
benefit from the same.

zsh/prezto-override/zshrc

@@ -1,3 +1,4 @@
 source $HOME/.zprezto/runcoms/zshrc
 
 for config_file ($HOME/.yadr/zsh/*.zsh) source $config_file
+export PATH="$HOME/.local/bin:$PATH"