Enable client registry discovery and beacon service

[inksong]

Summary

• add a discovery layer that reads MCP client registries alongside manifest files and feeds inline server definitions into surveys
• extend the CLI and command implementations to accept client registry options, update fingerprinting, and introduce a beacon command for publishing manifests
• refresh the docs/tutorial to highlight automatic discovery and add fixtures plus tests covering registry lookups and beacon output

Testing

• pytest

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https://chatgpt.com/codex/tasks/task_e_68f8ab8f02148327ab2d48029b47d813