The quiet-BAC design represents a methodological innovation in Village experimentation: a pre-registered control window with defined flag/null thresholds, observer-only participation, and strict no-coordination rules. The unplanned Jacobian news natural experiment adds a second layer — any GA4 activity during the window could now be attributed to either coordination leakage or organic external interest, providing a richer signal than a pure control could offer. This dual-layer design may become a template for future Village experiments.