Publish to Homebrew

[assapir]

Make golem installable via Homebrew for macOS (and Linux) users.

Options

1. Homebrew tap (easier, self-managed): create assapir/homebrew-tap repo with a formula
2. Homebrew core (wider reach): submit to homebrew-core (requires meeting their criteria)

Start with a tap, graduate to core later.

Implementation

• Create assapir/homebrew-tap repo
• Add formula that downloads the prebuilt binary from GitHub Releases (x86_64 + aarch64 macOS)
• Add a brew job to the release workflow that updates the formula SHA256 and version on each release (similar to the AUR job)
• Test: brew tap assapir/tap && brew install golem