ServiceRegistry
A typed key-value store that lets modules share services without importing each other's internal packages.
// Publish a service in your module's Init():
registry.Register("user.UserProvider", myUserProvider)
// Consume it from another module via the typed getter:
userProvider := module.MustGetTyped[iface.UserProvider](registry, "user.UserProvider")
Combined with the shared/iface interfaces, this is how Orkestra avoids cross-module concrete imports: every consumer programs against an interface, every producer publishes one.