Shipping: Publish to MCP component registries and marketplaces

## About

We collected various [MCP package registries](https://github.com/crate/cratedb-mcp/blob/main/docs/research.md#package-registries) that can be used to publish/announce the CrateDB MCP Server.

- https://mcp.so/
- https://mcphub.tools/
- https://smithery.ai/
- https://glama.ai/mcp/servers
- https://www.mcpserverfinder.com/
- https://www.pulsemcp.com/
- All: [MCP Registry Registry MCP Server](https://github.com/mastra-ai/mastra/blob/4af513ca1a8e94354c788e40e900d49fbf1c9f86/packages/mcp-registry-registry/src/registry/registry.ts)
- https://github.com/chatmcp/mcpso
- https://mcpservers.org/

## References

- GH-1
- GH-75

Start by reading docs/research.md, especially the package registries section, then review GH-1 and GH-75 for related scope. Compare the listed registries and document the publishing requirements and selected targets; done means the CrateDB MCP Server has been published or announced on the agreed marketplaces.

Written by the indexing model from the issue text.