Context Matched Experiment

Build Friction Lab, a private workflow experiment journal in one HTML file. Compare baseline and intervention sessions within matching contexts using median minutes per event, baseline exposure weights and leave-one-context-out sensitivity. Flag interruptions, exclude insufficient comparisons, and estimate setup payback. Includes a worked demo, local saving, validated JSON backups and Markdown briefs. Customize style and sample audience. Descriptive results, not causal proof.