Notebook session ended
This session ended after eight hours.
Sign in again to continue from where you left off.
Notebook gate offline
The sign-in service is not responding right now.
Wait a minute and try again, or read what is already public from the hub.
The Polar-backed money spine. One entitlement gate every paid app asks "can this subject use this capability?" Cards map the spine (checkout, webhook, fold, entitlements, ratify), its governance through petrova and mary-wiki, the consumer apps wired or migrating onto it, the mistakes that cost paid users their access, and the gate-by-gate distance to the first live dollar.