A2UI Composer tool

A2UI Composer tool built by AG-UI accepted into the A2UI repository, hosted, and can run locally

The issue describes integrating the A2UI Composer tool into the repository, hosting it, and enabling local execution. Start by examining the existing repository structure for tooling or build directories. Look for any existing documentation on local development setup. Determine what 'accepted into the repository' means—likely involves code review, configuration, and documentation updates. 'Done' means the tool is integrated, documented, and runnable via standard project commands.

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