Convex MCP server

We're starting to use api-extractor for api reports. The saved versions are committed to reports/ directory, making it possible to track evolution of the public API. Since api-extractor .d.ts rollups don't support declaration map, using these as published types break jump-to-definition in VS Code. Until [declaration map rollups](https://github.com/microsoft/rushstack/issues/1886) are implemented we compile public types with `tsc --stripInternal`, which requires marking exports as internal at the index.ts barrel file level if they need to be used in multiple files.