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Install MudBlazor 9.2.0, replace Bootstrap layout with MudLayout/MudAppBar, create Chat.razor with message list, text input, auto-scroll, and hardcoded responses. Add ChatMessage shared model. Remove template pages (Counter, Weather), move health check to /health. Include OpenSpec change artifacts for the upcoming wire-responses-api work. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>