fix: preserve latest release and clean formula PRs

[DevVig]

The v0.2.1 release verification exposed two publication hygiene issues:

• promoting a prerelease did not automatically move GitHub’s Latest pointer, leaving the updater on v0.2.0 until corrected manually
• staging the formula artifact inside the checkout caused the generated formula PR to include a duplicate candidate/ file

This explicitly marks promoted releases as Latest and stages formula artifacts under the runner temp directory. Workflow YAML parsing and diff checks pass.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 2ed4719 and 0b6710a.

📒 Files selected for processing (2)

• .github/workflows/finalize-release.yml
• .github/workflows/release.yml

---

_{Comment @coderabbitai help to get the list of available commands.}

[Copilot]

Pull request overview

This PR improves release publication hygiene in the GitHub Actions release pipelines by (1) ensuring promoted releases are explicitly marked as GitHub “Latest”, and (2) preventing formula artifact staging inside the checkout so generated Homebrew formula PRs don’t include unintended extra files.

Changes:

• Download the formula artifact into the runner temp directory (${{ runner.temp }} / $RUNNER_TEMP) and reference it from there for smoke testing and PR creation.
• When finalizing a release, explicitly mark the promoted release as GitHub “Latest” via gh release edit --latest.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
.github/workflows/release.yml	Stages downloaded formula artifacts under the runner temp directory and updates paths used by smoke test and PR generation steps.
.github/workflows/finalize-release.yml	Ensures a promoted release is explicitly marked as GitHub “Latest” during finalization.

---

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