...It is not an application, but a documentation project that explains how contributors should understand the Astrid development model. The handbook covers the polyrepo structure, the kernel-is-dumb law, the RFC trigger, contribution tiers, and the release process. It is built with mdBook, which makes it suitable for local reading, web publication, and structured documentation workflows. The project gives contributors a shared reference for process, decision-making, and expectations before they make changes. Overall, it is a governance and onboarding guide for people contributing to the Astrid ecosystem.