Standalone Greeter Demo

This demo proves the SDK can run without HiveCast, without a managed platform, and without committed credentials.

Run from the repository root:

pnpm demo:standalone

What it proves:

the SDK packages build from this repo,
this package builds against @open-matrix/core,
a local unauthenticated nats-server is started for the demo only,
matrix package run starts the actor from the package manifest against that broker,
--check-op echo calls the actor over the Matrix runtime/NATS transport path,
no managed host service, machine link, provider account, provider API key, or local HTTP control server is involved.