fix: immutable releases blocking artifact uploads

[tsunaminoai]

Summary

• Fix release workflow to use gh release create instead of softprops/action-gh-release, which uploads all artifacts atomically before the release is published — avoiding the immutable release window
• Fix regression-protection ruleset scope from ~ALL (every branch) to ~DEFAULT_BRANCH (main only), which was blocking all feature branch pushes

Closes #61

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR addresses two GitHub automation problems: (1) release asset uploads failing due to the “immutable release” window, and (2) an overly broad branch ruleset scope that was blocking pushes to non-default branches.

Changes:

• Replace softprops/action-gh-release with a gh release create-based approach to better control release publishing timing and asset uploads.
• Narrow the regression-protection ruleset from all branches to only the default branch.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
.github/workflows/release.yml	Switch release creation to GitHub CLI to avoid immutable-release upload failures.
.github/rulesets/regression-protection.json	Limit enforcement scope to the default branch instead of all branches.

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