M1.4.1-M1.4.6: Beatrice CLI Interface - Complete Implementation

[LyeZinho]

Overview

Implement Beatrice CLI interface with argument parsing, interactive REPL, HTTP/WebSocket servers, and Mimi core integration.

Subtasks

• M1.4.1: Design CLI argument parsing structure
• M1.4.2: Implement CLI core with clap/structopt
• M1.4.3: Implement interactive REPL with history
• M1.4.4: Implement HTTP REST API server
• M1.4.5: Implement WebSocket server for real-time updates
• M1.4.6: Connect Beatrice to Mimi core message bus

Acceptance Criteria

• CLI accepts commands and routes to handlers
• REPL supports history and command completion
• HTTP endpoints respond with proper error handling
• WebSocket clients receive streaming updates
• Integration tests pass (Beatrice → Message Bus → Mimi → response)

Related

• Depends on: M1.3.2 Task 2: Implement state transitions with guard conditions #210 (M1.3 state machine - merged)
• Plan: docs/plans/2026-04-17-M1.3.2-state-machine-implementation.md