feat: skill expansion — browser, security, SQL, files (16 skills total)

Novas skills instaladas:
- openclaw-agent-browser   v1.0.0  CLI Chromium — navegação, login, screenshots, state
- skill-security-audit    v1.0.0  SAST scanning, prompt injection, secrets audit
- sql-toolkit             v1.0.0  PostgreSQL/MySQL/SQLite — schema, query, otimização
- file                    v1.0.0  Organização de arquivos por contexto
- file-summary            v1.0.0  Extração e resumo de PDFs, Word, Excel

Workspace expandido:
- TOOLS.md: +Browser automation, Security audit, SQL, File management
- AGENTS.md: +Linux Analyst section (comandos, logs, rede, scripts) + Full-stack strategy
- MEMORY.md: 16 skills indexadas, stack map, comandos Linux ref
- SESSION-STATE.md: atualizado com contexto completo
- lock.json: sincronizado com 16 skills instaladas

skills/openclaw-agent-browser/scripts/setup.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+# agent-browser setup script
+# Installs agent-browser globally and downloads Chromium
+
+set -e
+
+echo "🌐 Installing agent-browser..."
+
+# Check if already installed
+if command -v agent-browser &>/dev/null; then
+    VERSION=$(agent-browser --version 2>/dev/null || echo "unknown")
+    echo "✓ agent-browser already installed: $VERSION"
+else
+    npm install -g agent-browser
+    echo "✓ agent-browser installed"
+fi
+
+# Install Chromium
+echo "📦 Installing Chromium browser..."
+if [[ "$(uname)" == "Linux" ]]; then
+    agent-browser install --with-deps 2>/dev/null || agent-browser install
+else
+    agent-browser install
+fi
+echo "✓ Chromium ready"
+
+# Verify
+echo ""
+echo "🧪 Verifying..."
+agent-browser open https://example.com >/dev/null 2>&1
+TITLE=$(agent-browser get title 2>/dev/null || echo "")
+agent-browser close >/dev/null 2>&1
+
+if [[ "$TITLE" == *"Example"* ]]; then
+    echo "✅ agent-browser is working!"
+else
+    echo "⚠️  Installation complete but verification unclear. Try: agent-browser open https://example.com"
+fi
+
+agent-browser --version