Agent Skills: accelint-architecture-doc

Create or update a living ARCHITECTURE.md for a codebase. Use when the user wants to write, refresh, restructure, or maintain an architecture document; document how the system is organized across tech stack, deployment model, services, components, and data stores; or turn codebase findings into durable architecture docs for engineers or agents. Trigger on requests such as write an architecture doc, document this system, create or update ARCHITECTURE.md, give me a technical overview of this repo, or map out how this app is put together, even when the file is not named. Prefer this skill for file-producing architecture documentation, not for generic architecture advice, implementation planning, or diagram-only brainstorming unless that work is clearly part of updating the document.