[flexbox]

Summary

• Update every coding challenge to the current Expo SDK 58 toolchain, teaching only the current API rather than contrasting it with older versions
• data: React Native DevTools replaces the Chrome extension workflow (Components/Profiler/Network panels, Shift + m for dev tools plugins); TanStack Query v5 object syntax with queryKey/queryFn and isPending, plus response.ok error handling
• ecosystem: ESLint 9 flat config built up step by step (eslint-config-expo/flat, prettier/recommended, typescript-eslint, eslint-plugin-react flat presets, perfectionist for sorting), Storybook 10 setup via npm create storybook@latest with withStorybook + CSF3 typed stories, Jest/RNTL with async render, jest types in tsconfig.json, built-in Jest matchers, and current Maestro docs links
• expo-router: Pressable instead of TouchableOpacity, per-font @react-native-vector-icons/ionicons, SplashScreen from expo-splash-screen
• foundation: create-expo-app@latest --template blank-typescript, npx expo install for Expo-managed deps, PaperProvider named import, paths without baseUrl, npm lockfile in the tree listings
• release: refresh the EAS Update / distribution instructions and drop stale external references
• Add hackathon/agentic-coding, a new Expo SDK 58 + Expo Router sample app for the agentic-coding hackathon track, with the argent agent configuration (skills, subagent, MCP and editor settings) and a mock agent chat UI
• Tidy setup/README.md

Summary of review feedback addressed

• Removed every "deprecated / no longer / gone / anymore" note so challenges describe only the current way
• Removed the legacy release blog-post link from challenges/release/01-legacy.md

Testing

• git diff grep over challenges/ confirms no remaining "deprecat / no longer / anymore / are gone / shut down / Classic" wording in the added lines
• Verified the removed release article link had no other occurrence in challenges/, setup/, or README.md
• Walking each challenge end-to-end in a fresh project: Not run
• hackathon/agentic-coding build/lint/test in CI: Not run