A green CI job after an agent patch is not evidence that behavior held. The useful signal is whether the same seed corpus still executed, whether fixture hashes stayed put, and whether the flake freeze budget did not grow. If any of those three ledgers moved the wrong way, the patch is not a fix. It is a quieter test suite. This article proposes a merge gate you can run as a script. It does not require a new framework. It requires treating seeds, fixture hashes, and flake slots as inventory t...