Union MCP

# TODO ## Milestone 1 - [X] Create a hello world basic MCP app server and connect to it via Claude Desktop - [X] Deploy basic MCP server to Union serving - [X] example: connect to remote MCP server - [X] Get an authenticated `UnionRemote` object - [X] List all task and workflow metadata available - [X] v0 interface: expose tools to call existing tasks and workflows - [X] example: use with Claude Desktop - [X] example: integrate with Cursor IDE - [ ] example: integrate with Open WebUI - [ ] example: integrate with VSCode ## Milestone 2 - [ ] v1 extensions: expose tools to register user-defined tasks and workflows, deploy apps - [ ] example: IDE or UI authors Union code, user confirms and pushes to Union ## Milestone 3 - [ ] v2 interface: expose tool to author tasks, workflows, apps, and projects - [ ] example: IDE or UI sends natural language prompt to Union, Union generates tasks, workflows, app, returns to UI for confirmation/editing, then user confirms to deploy to Union.