Configure JupyterLab for Amp orbs

[snamber]

Summary

• add an idempotent orb setup script that installs uv, syncs the workspace, registers ty server with Jupyter-LSP, and enables automatic completion
• declare JupyterLab as a supervised Amp portal service with *.onamp.dev origin handling
• ignore Jupyter-LSP virtual documents while keeping the service declaration tracked

Verification

• ran .agents/setup twice (warm run completed in 0.02s)
• validated the setup script with bash -n
• parsed .amp/services.yaml successfully
• started the declared service with amp orb services ensure
• verified the portal returns HTTP 200
• verified the ty LSP session reaches started and exchanges client/server messages