Feature Systems Guide A "system" is a self-contained, domain-driven module that owns everything related to one domain: its API calls, query layer, hooks, components, and public API. Systems live under a directory. Read for the full directory structure and naming conventions. Read for annotated implementation patterns per layer. Quick Reference Mandatory Companion Skills Activate alongside this skill — systems span multiple technical domains: | Situation | Activate | | --------------------- | ----------------------------------------- | | Any hook or component | + | | Data fetching/caching | |…