Release Sanity

Instant risk signal for every pull request

Release Sanity analyzes pull request diffs and posts an instant release risk check directly on the PR. A single structured comment shows a risk level (HIGH / MEDIUM / LOW), highlights risky areas like auth, APIs, billing, migrations, and deploy config, and generates a release-readiness checklist. The comment updates as the PR changes so teams can quickly sanity-check a release before merging.