feat: biblioteca inteligente libs/ + 5 novas skills (20 skills total)

NOVAS SKILLS:
- next-best-practices      v0.1.0  (CLEAN) — Next.js App Router, RSC, caching, data
- nextjs-patterns          v1.0.0  (CLEAN) — Next.js 15: Server Actions, route handlers
- vite                     v1.0.0  (CLEAN) — env vars, aliases, proxy, CJS compat
- uncle-bob                v1.0.0  (CLEAN) — Clean Code, SOLID, Clean Architecture
- clean-code-review        v1.0.0  (CLEAN) — naming, guard clauses, anti-patterns, refactoring
- vue                      v1.0.0  (CLEAN) — Vue framework
- vue-composition-api-best-practices v1.0.0 (CLEAN) — composables, Pinia, reactivity

BIBLIOTECA INTELIGENTE libs/ (10 dominios, 11 arquivos):
- typescript/ — TS safe + generics gotchas
- react/ — Next.js App Router + Vite config
- vue/ — Composition API + Pinia
- linux/ — System diagnostic cheatsheet
- database/ — PostgreSQL + MySQL patterns
- browser/ — Chromium CLI + E2E testing
- security/ — SAST audit (OWASP Top 10)
- best-practices/ — Clean Code + SOLID + Clean Architecture
- deploy/ — Docker multi-stack + OpenClaw ops
- + INDEX.md como guia de navegacao

.learnings/ — LRN-20260519-003 criado (biblioteca compartilhada)

libs/browser/E2E_TESTING.md

@@ -0,0 +1,37 @@
+# E2E Testing — Pirâmide e Padrões
+
+> Extraído de `e2e-testing-patterns` v1.0.0
+
+## 🏔️ Test Pyramid
+```
+        /\           ← POUCOS: Critical paths (E2E)
+       /E2E\          ← MAIS: Component/API integration
+      /─────\
+     /Integr\         ← MUITOS: Unit tests (rápidos, isolados)
+    /────────\
+   /Unit Tests\
+  /────────────\
+```
+
+## O que E2E Tests DEVEM cobrir
+| ✅ E2E | ❌ Não E2E |
+|--------|-----------|
+| Critical journeys (auth → dashboard → logout) | Lógica unitária → use unit tests |
+| Multi-step flows (checkout, onboarding) | API contracts → use integration |
+| Cross-browser | Edge cases (muito lento) |
+| Real API integration | Internal implementation |
+| Auth flows | Visual states → use Storybook |
+
+## Core Principles
+| Princípio | Como |
+|-----------|------|
+| **Test behavior, not implementation** | Assert em outcomes visíveis, não estrutura DOM |
+| **Independent tests** | Cada teste cria próprios dados e limpa |
+| **Deterministic waits** | Esperar por condição, não timeout fixo |
+| **Stable selectors** | Usar `data-testid`, roles, labels — nunca CSS classes |
+| **Fast feedback** | Mockar serviços externos, paralelizar, shard |
+
+## Selector Priority
+```
+data-testid → data-cy → role → text → id → class (último recurso)
+```