Remove the signup code; applications always queue for MA review, invite per node

src/main.rs

@@ -185,6 +185,11 @@ enum RegistryCommand {
         #[arg(long)]
         registry_url: Option<String>,
     },
+    Invite {
+        id: String,
+        #[arg(long)]
+        registry_url: Option<String>,
+    },
     SetRelays {
         #[arg(required = true)]
         relays: Vec<String>,
@@ -193,10 +198,6 @@ enum RegistryCommand {
     Serve {
         #[arg(long, default_value = "127.0.0.1:7800")]
         listen: String,
-        #[arg(long)]
-        signup_code: Option<String>,
-        #[arg(long)]
-        registry_url: Option<String>,
     },
 }
 
@@ -364,13 +365,12 @@ async fn main() -> Result<()> {
             RegistryCommand::Approve { id, registry_url } => {
                 commands::registry_approve(&dir, &id, registry_url.as_deref())?
             }
+            RegistryCommand::Invite { id, registry_url } => {
+                commands::registry_invite(&dir, &id, registry_url.as_deref())?
+            }
             RegistryCommand::SetRelays { relays } => commands::registry_set_relays(&dir, &relays)?,
             RegistryCommand::Show => commands::registry_show(&dir)?,
-            RegistryCommand::Serve {
-                listen,
-                signup_code,
-                registry_url,
-            } => commands::registry_serve(&dir, &listen, signup_code, registry_url).await?,
+            RegistryCommand::Serve { listen } => commands::registry_serve(&dir, &listen).await?,
         },
         Command::Aggregates {
             from,