MAESTRO: Add code sample generation engine for hook documentation

Create scripts/generate-code-samples.mjs that:
- Analyzes each hook's type, parameters, and naming patterns
- Generates three levels of code examples (basic, practical, advanced)
- Detects hook categories from naming conventions
- Outputs to static/api/code-samples.json for reuse
- Supports product-specific context in examples

Author: zackkatz