Function extract_files 

pub fn extract_files(raw: &str, default_language: &str) -> Vec<GeneratedFile>

Extract multiple files from a raw LLM response.

Recognizes these patterns before/inside code fences:

• # filepath: app/config.py
• ### app/models/user.py
• **app/config.py**
• <!-- file: src/index.ts -->
• First line inside fence: # app/config.py (comment-style path)