surface-camera-build
29ae3b53f1
V3::encode wrote a hardcoded VERSION_V3. It had no callers, so the mistake cost nothing — and then userspace's v4 writer became the first caller, and a v4 geometry would have been published under a v3 header: every reader walking a 42-byte index 40 bytes at a time, finding a store that is silently wrong. One wrong byte, found before the first v4 image was written rather than after.