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/file-summary/SKILL.md

@@ -0,0 +1,81 @@
+---
+name: file-summary
+description: |
+  Local document summary tool. Activate when user mentions "总结文件", "帮我总结", "总结文档", "分析文档" or provides a local file path (txt/docx/pdf/xlsx/xls).
+---
+
+# File Summary Tool
+
+Single tool `file_summary` for local document text extraction and summary.
+
+## Token Extraction
+
+From user input `帮我总结 D:\测试.pdf` → `file_path` = `D:\测试.pdf`
+
+## Actions
+
+### Extract Document Content
+
+{ "action": "extract", "file_path": "D:\\测试.pdf" }
+
+Returns:
+- Success: Plain text content of the document (txt/docx/pdf/xlsx/xls)
+- Error: Error message starting with ❌ (e.g. ❌ File not found, ❌ Unsupported format)
+
+### Generate Summary
+
+{ "action": "summary", "file_path": "D:\\测试.pdf" }
+
+Returns: Concise summary of the document content (integrated with OpenClaw LLM)
+
+## Workflow
+
+To summarize a local document:
+1. Extract content: `{ "action": "extract", "file_path": "your_file_path" }` → returns plain text
+2. Generate summary: OpenClaw LLM summarizes the extracted text automatically
+
+## Configuration
+
+channels:
+  local:
+    tools:
+      file_summary: true # default: true
+      python: true # required - need Python environment
+
+## Dependency
+
+### Required Environment
+1. Python 3.8+ (added to system environment variables)
+2. Required Python packages (auto-installed by script):
+   - python-docx (for docx)
+   - pypdf (for pdf)
+   - openpyxl (for xlsx)
+   - xlrd==1.2.0 (for xls)
+
+### Tool Path Configuration
+1. Place the tool files in OpenClaw's skill folder:
+   OpenClaw/skills/file-summary/
+   ├─ SKILL.md (this file)
+   ├─ file2sum.py
+2. Set the execution command in OpenClaw:
+   ${skill_path}\\file2sum.py
+
+## Permissions
+
+Required:
+- Local file read permission (user needs to grant file access)
+- Python execute permission (no special system permissions required)
+
+## Usage
+
+### Local Deployment
+1. Put the `file-summary` folder into OpenClaw's `skills` directory
+2. Restart OpenClaw
+3. User input example:
+   - "帮我总结 D:\测试.pdf"
+   - "总结文件 D:\数据\销售表.xlsx"
+
+### Public Deployment
+1. Upload the `file-summary` folder (include md/py) to a public platform (e.g. GitHub/Gitee, ClawHub)
+2. Share the download link
+3. Users import via OpenClaw "Skill Market → Import from URL"