Integrate the rounded source without changing the point calculation

The six-source training-transfer qualification is complete. Do not restart it or reuse its allowance. Keep all earlier results and failures preserved.

Create a separate native candidate. Advance the physical and reference source streams once per actual packet. Reuse its midpoint source for both world-step estimates; retain the original end-step update and calibrated differences of later force samples.

For the first force sample, use the identity

Retain the original treatment of later force differences. Reconcile the new expression explicitly to the old numerical reference center, adding its exact known difference to the error allowance. Keep all 27 physical plus 24 shared columns and their bindings unchanged.

Run local center/row/containment checks before freezing the original 24-control native matrix under unchanged acceptance limits. Only after that gate passes may a new complete prediction-width comparison run. The width target remains four of six groups; no source-component result changes it.