Interface OutcomeMeasurementDeprecated

Deprecated as of this minor. Outcome capabilities (incremental sales lift, brand lift, foot traffic, etc.) are now declared via reporting_capabilities.available_metrics (the same path used for impressions, conversions, ROAS) with qualifier.attribution_methodology and qualifier.attribution_window carrying the methodology and window on commit. New implementations SHOULD use the unified pattern; this field is retained for one-minor backwards compatibility and removed at the next major. See outcome-measurement.json description for migration guidance.