[WIP] Add support for MCPB bundle delivery

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Consider shipping MCPB bundle</issue_title>
<issue_description>It is now possible to deliver MCP servers as a zip bundle with manifest and in this case a compiled binary (which is supported), and enable easy installation in all clients without docker involved.

https://blog.modelcontextprotocol.io/posts/2025-11-20-adopting-mcpb/

As a first step we can add this as a build artefact in releases, and look later at how best to distribute more deliberately.</issue_description>

Comments on the Issue (you are @copilot in this section)

@SamMorrowDrums The binary support is a blocker though https://github.com/modelcontextprotocol/mcpb/issues/63#issuecomment-3566643246

• Fixes Consider shipping MCPB bundle #1470

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