360 GSA arrays (120 1000 Genomes individuals x 3 replicates): concordance 0.9934 vs NYGC 30x (0.9958 on sites in both sets), 0.9985 vs GIAB HG001 v4.2.1 (non-ref F1 0.997), replicate concordance 0.9966; allele-swap sites 0.016 %; 358/360 replicate pairs detected as duplicates. Plan §16.5 metrics in docs/validation/P8.md (K-024). Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01814GKVzZVL3FuF3DeiZXhv