Fix antidote plugin loading and Homebrew PATH on fresh machines

antidote's bundle script is a zsh file that isn't executable, so running
it from sh silently fails and produces an empty ~/.zsh_plugins.zsh. Run
it explicitly with zsh.

Add homebrew/path.zsh so interactive shells always get /opt/homebrew/bin
in PATH — previously this relied on ~/.env-vars which is only written
when Homebrew is first installed (not when it's pre-installed on the
base image).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: tylerwolf

antidote/install.sh

@@ -2,5 +2,5 @@
 eval "$(/opt/homebrew/bin/brew shellenv)"
 brew install antidote || brew upgrade antidote
 ANTIDOTE="$(brew --prefix)/opt/antidote/share/antidote/antidote"
-"$ANTIDOTE" bundle <"$DOTFILES/antidote/zsh_plugins.txt" >~/.zsh_plugins.zsh
-"$ANTIDOTE" update
+zsh "$ANTIDOTE" bundle <"$DOTFILES/antidote/zsh_plugins.txt" >~/.zsh_plugins.zsh
+zsh "$ANTIDOTE" update

homebrew/path.zsh

@@ -0,0 +1 @@
+eval "$(/opt/homebrew/bin/brew shellenv)"