Attach conformance evidence to releases

[iHow1]

Context

Releases should be tied to evidence, not broad claims.

Maintenance task

Add a release automation workflow that attaches conformance summaries to GitHub releases.

Proposed workflow

1. Run npm test.
2. Save conformance output as a release artifact.
3. Generate release notes from commits and known gaps.
4. Include a maintainer checklist for overclaim review.

Codex OSS relevance

This is a direct use case for Codex-assisted release workflows and maintainer automation.