schema: spec-driven

context: |
  Chat Agent WebApp — personal AI chat app built with Blazor WebAssembly + OpenAI GPT API.
  Tech stack: .NET 9, C# 13, Blazor WASM (standalone client), ASP.NET Core Web API (backend proxy).
  Key libraries: OpenAI SDK 2.9.1, Markdig 1.1.1, MudBlazor 9.2.0, System.Text.Json.
  Storage: JSON files on local disk. Single-user, no auth.
  The project is also a Blazor tutorial — every concept must have inline comments explaining what and why.
  See openspec/specs/project/ and openspec/specs/stack/ for full details.