chore: lock the plugin boundary and remove 2.9.0 leftovers

src/backend/hosts/connect/auth-provider-registry.ts

@@ -37,7 +37,7 @@ export function listSshAuthTypeOwners(): Array<
   return ownerSource();
 }
 
-export function findSshAuthTypeOwner(type: string): SshAuthTypeOwner | null {
+function findSshAuthTypeOwner(type: string): SshAuthTypeOwner | null {
   const owner = ownerSource().find((entry) => entry.type === type);
   return owner
     ? { pluginId: owner.pluginId, pluginName: owner.pluginName }
@@ -91,6 +91,11 @@ export function listSshAuthProviders(): SshAuthProvider[] {
   return [...providers.values()];
 }
 
+/** Whether a registered provider works for a host that is never saved. */
+export function isQuickConnectAuthType(type: string): boolean {
+  return providers.get(type)?.quickConnect === true;
+}
+
 /** Types a stored credential may use. */
 export function listCredentialTypes(): string[] {
   return listSshAuthProviders()