feat: add claude-code-guide and import security skills

skills/claude-code-guide/SKILL.md

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+---
+name: Claude Code Guide
+description: Master guide for using Claude Code effectively. Includes configuration templates, prompting strategies "Thinking" keywords, debugging techniques, and best practices for interacting with the agent.
+---
+
+# Claude Code Guide
+
+## Purpose
+
+To provide a comprehensive reference for configuring and using Claude Code (the agentic coding tool) to its full potential. This skill synthesizes best practices, configuration templates, and advanced usage patterns.
+
+## Configuration (`CLAUDE.md`)
+
+When starting a new project, create a `CLAUDE.md` file in the root directory to guide the agent.
+
+### Template (General)
+
+```markdown
+# Project Guidelines
+
+## Commands
+
+- Run app: `npm run dev`
+- Test: `npm test`
+- Build: `npm run build`
+
+## Code Style
+
+- Use TypeScript for all new code.
+- Functional components with Hooks for React.
+- Tailwind CSS for styling.
+- Early returns for error handling.
+
+## Workflow
+
+- Read `README.md` first to understand project context.
+- Before editing, read the file content.
+- After editing, run tests to verify.
+```
+
+## Advanced Features
+
+### Thinking Keywords
+
+Use these keywords in your prompts to trigger deeper reasoning from the agent:
+
+- "Think step-by-step"
+- "Analyze the root cause"
+- "Plan before executing"
+- "Verify your assumptions"
+
+### Debugging
+
+If the agent is stuck or behaving unexpectedly:
+
+1. **Clear Context**: Start a new session or ask the agent to "forget previous instructions" if confused.
+2. **Explicit Instructions**: Be extremely specific about paths, filenames, and desired outcomes.
+3. **Logs**: Ask the agent to "check the logs" or "run the command with verbose output".
+
+## Best Practices
+
+1. **Small Contexts**: Don't dump the entire codebase into the context. Use `grep` or `find` to locate relevant files first.
+2. **Iterative Development**: Ask for small changes, verify, then proceed.
+3. **Feedback Loop**: If the agent makes a mistake, correct it immediately and ask it to "add a lesson" to its memory (if supported) or `CLAUDE.md`.
+
+## Reference
+
+Based on [Claude Code Guide by zebbern](https://github.com/zebbern/claude-code-guide).