docs: Create comprehensive hook development guide

## Overview
Create a comprehensive guide for developing, testing, and contributing new pre-commit hooks to this repository.

## Purpose
Provide clear documentation to help contributors:
- Understand hook architecture and standards
- Develop new hooks following best practices
- Test hooks thoroughly
- Submit quality contributions

## Content Requirements

### 1. Hook Development Basics
- [ ] What are pre-commit hooks?
- [ ] Repository structure overview
- [ ] Naming conventions
- [ ] File organization

### 2. Writing Hooks
- [ ] Shell script best practices
- [ ] Error handling patterns
- [ ] Input/output standards
- [ ] Exit codes and their meanings
- [ ] Dependency management

### 3. Security Guidelines
- [ ] Input validation
- [ ] Safe file operations
- [ ] Avoiding command injection
- [ ] Secret handling
- [ ] Permission requirements

### 4. Testing Hooks
- [ ] Using the bats framework
- [ ] Writing effective tests
- [ ] Mocking external commands
- [ ] Coverage requirements
- [ ] CI integration

### 5. Contributing Process
- [ ] Fork and clone workflow
- [ ] Branch naming conventions
- [ ] Commit message format
- [ ] PR requirements
- [ ] Review process

### 6. Examples
- [ ] Simple hook example
- [ ] Complex hook with dependencies
- [ ] Multi-file processing hook
- [ ] Language-specific hook

### 7. Common Patterns
- [ ] File filtering
- [ ] Parallel processing
- [ ] Progress reporting
- [ ] Configuration handling
- [ ] Cross-platform compatibility

### 8. Troubleshooting
- [ ] Common errors
- [ ] Debugging techniques
- [ ] Performance optimization
- [ ] Platform-specific issues

## Deliverables
- [ ] CONTRIBUTING.md enhancement
- [ ] docs/HOOK_DEVELOPMENT.md guide
- [ ] Example hook template
- [ ] Test template
- [ ] Quick reference card

## Success Criteria
- Clear, comprehensive documentation
- Practical examples
- Reduced barrier to contribution
- Consistent hook quality
- Faster PR reviews

## Related
- #26 - CI/CD implementation
- #27 - Test coverage
- Current CONTRIBUTING.md needs update