Upgrade adapter-utils to canary with getConfigSchema type support

The UI wasn't surfacing config parameters because getConfigSchema wasn't
part of the ServerAdapterModule interface in adapter-utils >=0.3.0. The
canary release (2026.411.0-canary.8) adds ConfigFieldSchema,
AdapterConfigSchema, and getConfigSchema to the type. This removes the
local type augmentation workaround and the unsafe `as ServerAdapterModule`
cast, letting TypeScript properly validate the schema contract.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

src/server/index.ts

@@ -15,7 +15,7 @@ export function createServerAdapter(): ServerAdapterModule {
     supportsLocalAgentJwt: true,
     agentConfigurationDoc,
     getConfigSchema,
-  } as ServerAdapterModule;
+  };
 }
 
 export { execute, testEnvironment, sessionCodec };