refactor: replace overloaded surface terminology

packages/self-modification/tool-cordis/tests/inspect.spec.ts

@@ -66,7 +66,7 @@ describe('cordis_inspect', () => {
     expect(report).toContain('export interface SessionSurface')
     // A type only reachable through a NOT-live service (e.g. bash) is scoped out.
     expect(report).not.toContain('export interface BashRunResult')
-    // The inherited ctx surface closes the section.
+    // The inherited ctx API closes the section.
     expect(report).toContain('inherited ctx API:')
     expect(report).toContain('- ctx.effect — ')
     // The broad report stays compact; exact-name lookup owns full JSDoc.

packages/self-modification/tool-cordis/tests/tool-cordis.spec.ts

@@ -4,7 +4,7 @@ import * as tool from '../src/index.ts'
 import { setup } from './helpers.ts'
 
 /**
- * Export-shape and registration surface: the namespace-plugin contract the
+ * Export shape and registration API: the namespace-plugin contract the
  * real Loader path depends on, the registered tool set, and the Config
  * validator's defaults and rejections.
  */