Identity for the Pico Engine

Summary: Version 1.5 of the Pico Engine finally brings identity into the engine itself: passkeys for humans, and OAuth for external apps and webhooks. Here's the shape of the design, why identity is really three problems and not one, and why I shipped the human and third-party layers before the pico-to-pico layer. Today I'm releasing version 1.5 of the Pico Engine . The primary features in this…