Selects Chainlit as the chat UI library (AI-native, Python, handles
WebSocket/streaming/session out of the box). Establishes Python as the
project language. Documents accessibility gap mitigations (ARIA live
regions, focus management, reduced-motion, contrast overrides). Defines
project layout and Chainlit configuration.
https://claude.ai/code/session_01SUWzMzFvSfWiHXA2p6rPg9
