stable-core: publish Homebrew tap formula after package-index proof

[sakibshuvo]

Problem

The repo has Homebrew formula template/prototype coverage, but stable-core package-manager proof needs a real tap install path after PyPI/TestPyPI evidence exists. External launch review flagged this as separate from Python package-index publication.

Acceptance Criteria

• A Homebrew tap repository exists for Entroping or the chosen distribution strategy explicitly rejects Homebrew with a documented reason.
• brew install sakibshuvo/tap/entroping or the final documented tap command works on a fresh macOS runner.
• The formula pins a released artifact/checksum rather than a local template.
• CI or release evidence records the tap URL, formula commit, install-smoke output, and rollback/update notes.
• Stable-core remains false unless PyPI/TestPyPI proof, compatibility discipline, downstream feedback, and other stable-core blockers are satisfied.

Blocked By

• stable-core: configure TestPyPI Trusted Publisher #303
• stable-core: publish first TestPyPI alpha and smoke install #304
• stable-core: publish first PyPI alpha after TestPyPI proof #305