Reorganize: Move all skills to skills/ folder

- Created skills/ directory
- Moved 272 skills to skills/ subfolder
- Kept agents/ at root level
- Kept installation scripts and docs at root level

Repository structure:
- skills/           - All 272 skills from skills.sh
- agents/           - Agent definitions
- *.sh, *.ps1       - Installation scripts
- README.md, etc.   - Documentation

Co-Authored-By: Claude <noreply@anthropic.com>

skills/code-review/skill.md

@@ -0,0 +1,121 @@
+---
+name: code-review
+description: Automated code review for pull requests using specialized review patterns. Analyzes code for quality, security, performance, and best practices. Use when reviewing code changes, PRs, or doing code audits.
+source: anthropics/claude-code
+license: Apache-2.0
+---
+
+# Code Review
+
+## Review Categories
+
+### 1. Security Review
+Check for:
+- SQL injection vulnerabilities
+- XSS (Cross-Site Scripting)
+- Command injection
+- Insecure deserialization
+- Hardcoded secrets/credentials
+- Improper authentication/authorization
+- Insecure direct object references
+
+### 2. Performance Review
+Check for:
+- N+1 queries
+- Missing database indexes
+- Unnecessary re-renders (React)
+- Memory leaks
+- Blocking operations in async code
+- Missing caching opportunities
+- Large bundle sizes
+
+### 3. Code Quality Review
+Check for:
+- Code duplication (DRY violations)
+- Functions doing too much (SRP violations)
+- Deep nesting / complex conditionals
+- Magic numbers/strings
+- Poor naming
+- Missing error handling
+- Incomplete type coverage
+
+### 4. Testing Review
+Check for:
+- Missing test coverage for new code
+- Tests that don't test behavior
+- Flaky test patterns
+- Missing edge cases
+- Mocked external dependencies
+
+## Review Output Format
+
+```markdown
+## Code Review Summary
+
+### 🔴 Critical (Must Fix)
+- **[File:Line]** [Issue description]
+  - **Why:** [Explanation]
+  - **Fix:** [Suggested fix]
+
+### 🟡 Suggestions (Should Consider)
+- **[File:Line]** [Issue description]
+  - **Why:** [Explanation]
+  - **Fix:** [Suggested fix]
+
+### 🟢 Nits (Optional)
+- **[File:Line]** [Minor suggestion]
+
+### ✅ What's Good
+- [Positive feedback on good patterns]
+```
+
+## Common Patterns to Flag
+
+### Security
+```javascript
+// BAD: SQL injection
+const query = `SELECT * FROM users WHERE id = ${userId}`;
+
+// GOOD: Parameterized query
+const query = 'SELECT * FROM users WHERE id = $1';
+await db.query(query, [userId]);
+```
+
+### Performance
+```javascript
+// BAD: N+1 query
+users.forEach(async user => {
+  const posts = await getPosts(user.id);
+});
+
+// GOOD: Batch query
+const userIds = users.map(u => u.id);
+const posts = await getPostsForUsers(userIds);
+```
+
+### Error Handling
+```javascript
+// BAD: Swallowing errors
+try {
+  await riskyOperation();
+} catch (e) {}
+
+// GOOD: Handle or propagate
+try {
+  await riskyOperation();
+} catch (e) {
+  logger.error('Operation failed', { error: e });
+  throw new AppError('Operation failed', { cause: e });
+}
+```
+
+## Review Checklist
+
+- [ ] No hardcoded secrets
+- [ ] Input validation present
+- [ ] Error handling complete
+- [ ] Types/interfaces defined
+- [ ] Tests added for new code
+- [ ] No obvious performance issues
+- [ ] Code is readable and documented
+- [ ] Breaking changes documented