airlock: CI release gate for AI prompts, skills, MCP servers, and models

Airlock is an open-source release engineering tool written in Go that treats AI components (prompts, skills, MCP servers, models) as versioned releasable units inside a CI/CD pipeline. It detects behavioral changes between snapshots, runs statistical evaluation against a policy engine, and outputs PASS/FAIL/NEEDS_APPROVAL verdicts to block or approve a release. Licensed Apache 2.0 with a CLI covering init, snapshot, diff, test, and ci subcommands.