refactor: replace overloaded surface terminology

packages/core/tools/tests/code-mode.spec.ts

@@ -1229,7 +1229,7 @@ describe('the run_code dispatch bridge', () => {
     const tool = ctx.tools.get(RUN_CODE_NAME)!
 
     expect(result.content).toEqual([{ type: 'text', text }])
-    // Surfaces keep the pending program title and render this durable content
+    // Presenters keep the pending program title and render this durable content
     // through their generic fallback. Omitting a result view also prevents the
     // host frame from carrying the same raw content a second time.
     expect('presentResult' in tool).toBe(false)

packages/core/tools/tests/tools.spec.ts

@@ -2593,7 +2593,7 @@ describe('defineTool validation (the runtime-validation Agent Note, part 1)', ()
     expect(err.message).toBe('invalid arguments: missing required property "a"; "b" must be a number')
   })
 
-  it('a schema-invalid call surfaces the structured error on the result', async () => {
+  it('a schema-invalid call APIs the structured error on the result', async () => {
     const ctx = await setup()
     ctx.tools.register(defineContentToolFixture({
       name: 'reader',