chore(packaging): add Homebrew cask for deployment bundles

[Liam-Deacon]

Problem

Once CLEED has reliable deployment bundles (macOS app/bundles), we should ship a Homebrew cask for a smoother install/update path.

Scope

• Decide the canonical bundle artifact(s) and naming conventions.
• Create a Homebrew Cask (either in homebrew-cask or a dedicated tap) referencing the release assets.
• Add CI/release automation to publish and update the cask on tagged releases.
• Document install/update instructions in docs.

Acceptance Criteria

• brew install --cask cleed (or cleed-gui if scoped) installs the app bundle.
• The cask updates with each tagged release.
• Documentation references the cask as the recommended macOS install method.