feat(update): add Homebrew readiness contract

[skevetter]

Summary

• add a reusable build-time package-manager identity while preserving direct-release self-update behavior
• direct Homebrew-managed installs to brew upgrade devsy
• build dedicated Homebrew-managed macOS and Linux release binaries without changing direct-install or desktop binaries
• publish those managed assets, verify their update guidance in the release job, and generate the tap formula against them

Validation

• go test ./cmd/update ./hack/homebrew_formula -count=1
• git diff --check
• .github/workflows/release.yml and .goreleaser.yml parse as YAML
• CI builds the ordinary CLI on Linux, macOS, and Windows; the release job is the source of truth for the dedicated Homebrew artifacts

Notes

• formula ownership stays in devsy-org/homebrew-tap; the release workflow continues generating and pushing it there
• ordinary release binaries keep direct self-update behavior
• no homebrew/core submission, merge, or release is included

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