[AC] Migrate from brew

AGENTS.md

@@ -8,7 +8,7 @@ This is a personal dotfiles repository targeting macOS (Apple Silicon + Intel) a
 
 Setup is platform-specific and runs from the repo root:
 
-- **macOS:** `./setup_mac.sh` — brews dependencies, creates a `neovim` virtualenv, then calls `./clone_and_link_mac.sh`. Uses GNU coreutils' `gln` (not `ln`), so coreutils must be installed first.
+- **macOS:** `./setup_mac.sh` — brews dependencies, installs the latest verified upstream Alacritty release, creates a `neovim` virtualenv, then calls `./clone_and_link_mac.sh`. Uses GNU coreutils' `gln` (not `ln`), so coreutils must be installed first.
 - **Arch:** `./setup_arch.sh` — pacman deps, then `./clone_and_link.sh` + `./copy_fonts_arch.sh`.
 - `clone_and_link*.sh` create the symlinks (`~/.zsh`, `~/.zshrc`, `~/.tmux`, `~/.tmux.conf`, `~/.config/nvim`, `~/.config/alacritty`, virtualenvwrapper hooks). `link_config.sh` is a simpler standalone variant.
 - `general_setup.sh` switches the login shell to zsh and triggers plugin installs.
@@ -33,5 +33,5 @@ Practical rule: **edit the `.example` source, not the generated symlink target.*
 
 ## Maintenance
 
-- `./update_mac.sh` — macOS update runner. Default (no args) runs `--brew-update --cleanup --diagnostics --update-others`; other flags: `--system-update`, `--permission-fix` (strips Caskroom/App quarantine xattrs). Run `./update_mac.sh --help` for the list. `--update-others` also runs `claude --update` and `Codex --update`.
-- `brew_autoupdate` — sets up scheduled brew auto-updates.
+- `./update_mac.sh` — macOS update runner. Default (no args) runs `--brew-update --cleanup --diagnostics --update-others`; other flags: `--system-update`, `--permission-fix` (strips Caskroom/App quarantine xattrs). Run `./update_mac.sh --help` for the list. `--update-others` also updates Alacritty from its verified upstream release, then runs `claude --update` and `Codex --update`.
+- `brew_autoupdate` — runs scheduled brew and Alacritty auto-updates.