feat(web): add workspace-aware session flow

packages/host/apiproxy/src/api/rpc-map.ts

@@ -6,6 +6,7 @@
 
 import type { SessionsApi } from './sessions.ts'
 import type { HostApi } from './host.ts'
+import type { WorkspaceApi } from './workspace.ts'
 import type { RpcResponse } from './rpc.ts'
 
 /** Method name → method signature. Signatures are the single source of truth; payload/value types are always derived from here. */
@@ -16,6 +17,8 @@ export interface RpcMethodMap {
   'session.prompt': SessionsApi['prompt']
   'session.cancel': SessionsApi['cancel']
   'host.describe': HostApi['describe']
+  'workspace.list': WorkspaceApi['list']
+  'workspace.create': WorkspaceApi['create']
 }
 
 /** Business request payload of method K (reaches through the RpcRequest narrow form to payload). */