refactor: remove deprecated Hammerspoon configuration and modules

zsh/.config/zsh/config/default.zsh

@@ -8,14 +8,12 @@ export VISUAL="micro"
 export SUDO_EDITOR="micro"
 
 export STARSHIP_CONFIG="$XDG_CONFIG_HOME"/starship/starship.toml
-export OPENCODE_EXPERIMENTAL_BACKGROUND_SUBAGENTS=true
 export HOMEBREW_NO_UPGRADE_AUTO_UPDATES_CASKS=1
 
 export PNPM_HOME="$HOME/.local/share/pnpm"
 
 typeset -U path
 path=(
-  "$HOME/.opencode/bin"
   "$PNPM_HOME/bin"
   $path
 )