Agent Skills: pre-release-check

Decide whether it's safe to cut a new release. Auto-detects the last release tag, gathers everything merged since, runs a build/test health gate, and fans out parallel review agents to hunt for release blockers — regressions, half-finished work, risky edge cases, breaking changes, missing tests, and release-readiness gaps. Produces a GO / NO-GO verdict with categorized blockers. Keywords pre-release, release blockers, go/no-go, release readiness, ship check, regression review.