The v2 fxcache on PVC passed has_ofi=true validation (mbp10_dir was present when built) but contained all-zero OFI data. The old binary set the flag based on directory existence, not actual computed values. Now counts non-zero OFI rows before accepting a cache — forces rebuild when MBP-10 data is available but OFI content is all zeros. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>