fix(release): install Homebrew executable path

[roodboi]

Summary

• write the Homebrew launcher to bin/hack instead of replacing the formula prefix's bin directory with a file
• make the formula renderer import-safe and directly test its generated install contract

Production evidence

The canonical v3.3.3 formula downloaded and installed successfully, but produced:

/opt/homebrew/Cellar/hack/3.3.3/bin: Bourne-Again shell script text executable

Because bin itself was a file, Homebrew linked no /opt/homebrew/bin/hack, and the formula's own #{bin}/hack --help test path could not exist. The generator emitted bin.write_env_script; Homebrew requires (bin/"hack").write_env_script.

Verification

• bun test tests/update-homebrew-tap.test.ts — 1 passed
• bunx ultracite check scripts/update-homebrew-tap.ts tests/update-homebrew-tap.test.ts — passed
• bun run --cwd packages/cli typecheck — passed
• real renderer invocation against release v3.3.3 produced Formula/hack.rb with (bin/"hack").write_env_script and the existing #{bin}/hack --help formula test

Compatibility and release signal

• release tarball layout and CLI behavior are unchanged
• only the generated Homebrew installation path changes
• this is a production packaging fix and should trigger the next patch release so the release workflow republishes the corrected formula

[roodboi]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Already looking forward to the next diff.

Reviewed commit: 3c6e0d95bf

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