refactor(api): colocate gateway and remote assembly

packages/api/remotes/src/index.ts

@@ -0,0 +1,18 @@
+/** Host BFF entry and Loader shell for the Remote contribution assembly. */
+
+export {
+  ApiRemoteSessionNotFound,
+  ApiRemoteSubagentSessionOwnership,
+  apiRemoteSubagentOwnershipError,
+  createApiRemoteAgentResolver,
+  hasApiRemoteSubagentOwner,
+  inspectApiRemoteSession,
+} from './agent-lookup.ts'
+export type {
+  ApiRemoteAgentOptions,
+  ApiRemoteAgentResult,
+  ApiRemoteLookupError,
+} from './agent-lookup.ts'
+
+/** Host plugin body; the selected contributions mount only in Client environments. */
+export function apply(): void {}