Adopt org-infra reusable Homebrew workflow for formula publishing

[sonupreetam]

Is your feature request related to a problem? Please describe.

complypack has no Homebrew distribution. Users must download binaries manually from GitHub Releases or use go install. A reusable Homebrew workflow is being built in org-infra (complytime/org-infra#500) to standardize source-build formula publishing across complytime repos.

Describe the solution you'd like

Add a Homebrew caller job to complypack's release.yml that invokes complytime/org-infra/.github/workflows/reusable_release_homebrew.yml after the GoReleaser release job completes. This would publish a source-build formula to complytime/homebrew-tap so users can install via brew install complytime/tap/complypack.

Blocked by: complytime/org-infra#500

Describe alternatives you've considered

• Inline Homebrew step in complypack's release.yml (rejected: would duplicate complyctl's approach and drift over time)
• Container-only distribution per ADR 012 (covers MCP server use case but not CLI binary installation)

Additional context

• complypack already produces darwin + linux binaries via GoReleaser (v0.0.9 has all archives)
• Cross-repo auth to complytime/homebrew-tap needs GitHub App setup (same pattern as complyctl)
• complytime/homebrew-tap currently only has a LICENSE file — no formulas published yet