[Roadmap] Miles Docs Polish

[Shi-Dong]

Tracking issue for documentation polishing.

Quick Start

• Add two flagship training examples — one for reasoning and one for agentic — both runnable on a single node.

Features

• Run an extensive fact check to make sure everything in the docs is true and up to date.

Developer guide

• Add contribution requirements: common sense, styles, etc.
• Add debug tools usage guide