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The canonical paper on main claimed a five-voter quorum 'tolerating two simultaneous failures' — physically impossible for BFT: f=2 needs N>=3f+1=7, with a 2f+1=5 quorum. Corrects all 10 fault-model sites (abstract, two-plane table, Topology, StatefulSet rolling-upgrade, Contributions recap, intro) to seven voters / 5-of-7 quorum / f=2, adding the N>=3f+1 and 2f+1=5 rationale. Rolling upgrade now correctly states maxUnavailable:1 keeps six-of-seven live, above the five-of-seven quorum. HIP-0125 references untouched (main's number is canonical; the stale paper-router-clean branch still said HIP-0116 and is superseded by this in-place fix). Prose-only; inline-math $-balanced. Co-authored-by: Hanzo Dev <[email protected]>