OptionalcountLive contact points in the narrow phase after the last step (§84). Optional:
adapters that cannot walk manifolds omit this and SolverStatistics.contactCount
stays NaN.
Visits every live body in creation order (§33).
Visits every live collider in creation order (§33).
World transform of one body (§42 "physics" authority's read).
DebugBodyAccess plus the centre-of-mass read —
SolverBodyAccess.getBodyCenterOfMass, transcribed 2026-08-04 (the member whose absence staged §113's centre-of-mass display from 2026-08-02, see the module header). Kept as an extension rather than a sixth member on DebugBodyAccess so every existing five-member source keeps satisfying the base seam unchanged; only collectCentersOfMass requires this one.