Chapter 1 — Core Foundation 1.1 Objective The first version of ACAI should begin with a small, working core rather than attempting to implement the entire architecture at once. The Chapter 1 pipeline is: User ↓ FastAPI ↓ ACAI Orchestrator ↓ Model Service ↓ AI Model ↓ Response The first implementation uses a Mock Model so the system can be tested without requiring an external API key. 1.2 Project Structure ACAI/ └── backend...