slug: p0 title: Beachhead Validation vision: 20-50 target users complete a 2-week concierge pilot with D2/D7 retention measured — proving the personal briefing concept is valuable enough for repeated use. features: - p0-target-segment-recruitment - p0-concierge-pilot-loop - p0-validation-readout created_at: 2026-03-03T06:29:53.105359Z updated_at: 2026-03-03T06:29:53.150315Z schema_version: 1