refactor: replace overloaded surface terminology

packages/client/connection/src/client/fixture.ts

@@ -71,7 +71,7 @@ const MARKDOWN_FIXTURE = [
   '- first item',
   '  - nested item',
   '',
-  '| Surface | State |',
+  '| Area | State |',
   '| --- | --- |',
   '| history | rendered |',
   '| streaming | stable |',

packages/client/connection/src/client/index.ts

@@ -46,7 +46,7 @@ export type { ClientConnectionRpc } from '../rpc.ts'
 export const inject: string[] = []
 
 /**
- * The ctx.connection service surface: the api client plus a one-shot
+ * The ctx.connection service API: the API client plus a one-shot
  * controller starter (the runtime plugin supplies sinks when its object layer
  * is ready — connection stays consumer-agnostic).
  */