In-App Chat v0.0.1 for Augment-It — The Prompt-Drafting Triad as the Demo Affordance

Gated enhancement made conversational: `prompts.draft` → `improve` → `apply`, with postconditions that check what the prompt promised.

• Plan
• Augment-It
• In-App-Agent-Chat
• Walking-Skeleton
• Prompt-Drafting-Triad
• Gated-Enhancement
• Client-Demo
• Strict-Alignment