feat: add a subagent frame

agentlite/examples/skills/code-reviewer/SKILL.md

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+---
+name: code-reviewer
+description: Review code for bugs, style issues, security vulnerabilities, and best practices. Use when the user asks to review, check, or audit code.
+type: standard
+---
+
+# Code Reviewer
+
+A comprehensive code review skill that checks for common issues and provides actionable feedback.
+
+## Review Checklist
+
+### 1. Correctness
+- Check for logical errors
+- Verify edge cases are handled
+- Look for off-by-one errors
+- Check null/None handling
+- Verify error handling paths
+
+### 2. Style & Readability
+- Naming conventions (clear, descriptive names)
+- Code organization and structure
+- Comments where needed (not obvious code)
+- Consistent formatting
+- Function/class length
+
+### 3. Performance
+- Inefficient algorithms (O(n²) when O(n) possible)
+- Unnecessary object creation
+- Memory leaks
+- Redundant operations
+
+### 4. Security
+- SQL injection vulnerabilities
+- XSS vulnerabilities (for web code)
+- Hardcoded secrets/passwords
+- Unsafe deserialization
+- Path traversal risks
+
+### 5. Best Practices
+- DRY principle (Don't Repeat Yourself)
+- SOLID principles
+- Proper use of language features
+- Test coverage considerations
+
+## Output Format
+
+Provide your review in this structure:
+
+```
+## Summary
+Brief overall assessment
+
+## Critical Issues
+- Issue 1: Description and fix
+- Issue 2: Description and fix
+
+## Warnings
+- Warning 1: Description and suggestion
+
+## Suggestions
+- Suggestion 1: How to improve
+
+## Positive Notes
+- What's done well
+```
+
+Be constructive and specific. Include code examples for suggested fixes.