Add eslint.config.mjs (flat config) using @typescript-eslint/eslint-plugin flat/recommended rules. Add npm run lint script (exits 0 on current codebase). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- npm init with express (prod) and typescript, ts-node, @types/express, @types/node, eslint, @typescript-eslint/parser, @typescript-eslint/eslint-plugin, vitest (dev) - Add .gitignore excluding node_modules/ and dist/ - Add CLAUDE.md documenting chosen stack, commands, and project structure Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>