Automate Homebrew tap formula updates

[faustodavid]

Summary

• remove the duplicate checked-in Formula/smith.rb from this repo so the tap formula is the source of truth
• add a Homebrew Tap Formula workflow that runs on pushed v* tags or manual dispatch and updates faustodavid/homebrew-tap/Formula/smith.rb
• add a deterministic formula updater script plus unit coverage for tag/revision replacement, stale checks, version matching, and unsafe tag rejection
• document the release flow and required HOMEBREW_TAP_TOKEN secret

Release safety

• validates the release tag shape before using it in git refspecs
• reads pyproject.toml from the tagged commit and rejects tag/version mismatches
• resolves the tag revision and rejects mismatched manual revision overrides
• runs ruby -c, brew audit --strict --formula, brew install --build-from-source, and brew test against a temporary local tap before pushing the tap update

Validation

• make check -> 723 passed plus lint, format, mypy, targeted coverage, and skill quality
• uv run --extra dev pytest tests/unit/test_update_homebrew_formula.py -q
• uv run --extra dev ruff check scripts/update_homebrew_formula.py tests/unit/test_update_homebrew_formula.py
• uv run --extra dev ruff format --check scripts/update_homebrew_formula.py tests/unit/test_update_homebrew_formula.py
• workflow YAML parse check
• updater --check path using pyproject.toml from v0.1.1

Tap note

Updated faustodavid/homebrew-tap separately so the live tap formula now pins v0.1.1 at commit c42aba12716518db8473536d15529302fbaf4482.