Simplify README

[benvinegar]

No description provided.

[greptile-apps]

Greptile Summary

Streamlines the README by removing detailed implementation examples and technical documentation that likely belong in separate docs. The changes make the README more approachable for new users while keeping core setup instructions intact.

• Updated tagline from "multiplayer coding agent infrastructure" to "multiplayer dev-assistant for eng teams - write code, act on alerts, and more"
• Removed "How work flows" example section (6-step workflow example)
• Simplified broker registration instructions by removing detailed CLI flags and polling behavior docs
• Removed env backend set-command example for advanced secret management
• Removed "Shell script architecture" section detailing bin/lib/ module structure
• Added "About" section attributing Baudbot to Modem team

Confidence Score: 5/5

• This PR is safe to merge with no risk
• Documentation-only changes that simplify the README without affecting any code functionality or introducing technical issues
• No files require special attention

Important Files Changed

Filename	Overview
README.md	Documentation simplification - removed detailed examples and broker docs, added Modem attribution

_{Last reviewed commit: 8fdaba7}