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perf: eliminate Three.js/WebGL, fix render-blocking CSS, add dev team agents
- Replace ShaderGradientBackground WebGL shader (3 static spheres) with pure
  CSS radial-gradient divs — moves from ClientProviders (deferred JS) to
  app/layout.tsx as a server component rendered in initial HTML. Eliminates
  @shadergradient/react, three, @react-three/fiber from the JS bundle.
  Removes chunks/7001 (~20s CPU eval) and the 39s main thread block.

- Remove optimizeCss/critters: it was converting <link rel="stylesheet"> to a
  JS-deferred preload, which PageSpeed read as a 410ms sequential CSS chain.
  Both CSS files now load as parallel <link> tags from initial HTML (~150ms).

- Update browserslist safari >= 15 → 15.4 (Array.prototype.at, Object.hasOwn
  are native in 15.4+; eliminates unnecessary SWC compatibility transforms).

- Delete orphaned app/styles/ghostContent.css (never imported anywhere, 3.7KB).

- Add .claude/ dev team setup: 5 subagents (frontend-dev, backend-dev, tester,
  code-reviewer, debugger), 3 skills (/add-section, /review-changes,
  /check-quality), 3 path-scoped rules, settings.json with auto-lint hook.

- Update CLAUDE.md with server/client orchestrator pattern, SSR animation
  safety rules, API route conventions, and improved command reference.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-03-05 23:40:01 +01:00

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Markdown

---
paths:
- "**/__tests__/**/*.ts"
- "**/__tests__/**/*.tsx"
- "**/*.test.ts"
- "**/*.test.tsx"
- "e2e/**/*.spec.ts"
---
# Testing Rules
## Jest environment
- Global mocks are set up in `jest.setup.ts` — do NOT re-mock `matchMedia`, `IntersectionObserver`, or `NextResponse` in individual tests
- Test env vars are pre-set: `DIRECTUS_URL`, `NEXT_PUBLIC_SITE_URL`
- Always mock external API calls (Directus, n8n, PostgreSQL) — tests must work without running services
## ESM modules
If a new import causes "Must use import to load ES Module" errors, add the package to `transformIgnorePatterns` in `jest.config.ts`.
## Server component tests
```typescript
// Server components return JSX, not a promise in React 19, but async ones need await
const resolved = await MyServerComponent({ locale: 'en', ...props })
render(resolved)
```
## next/image in tests
Replace `next/image` with a plain `<img>` in test renders:
```tsx
// eslint-disable-next-line @next/next/no-img-element
<img src={src} alt={alt} />
```
## Run commands
- Single file: `npx jest path/to/test.tsx`
- All unit tests: `npm run test`
- Watch mode: `npm run test:watch`
- Specific E2E: `npm run test:critical`, `npm run test:hydration`, `npm run test:accessibility`