node-io-cause.test.yaml's healthy fixture asserts NodeIOPressureHigh and
NodeIOPressureCritical quiet on the same measured prod state the eight new cause
rules are pinned against — the point of that fixture being that the detectors and
the cause rules must agree about what "healthy" is. The shrink-only register
entries are therefore stale, and the gate correctly refused them.
Co-Authored-By: Claude Opus 5 <[email protected]>