refactor: replace overloaded surface terminology

packages/pty/tool-bash-persistent/src/invariant.ts

@@ -17,7 +17,7 @@ export const inject = ['invariants']
 /**
  * No runtime invariant: the adapter's private owner-to-shell cache has no
  * observable event or data relation. Lifecycle tests prove its cleanup without
- * adding a public surface solely for an invariant.
+ * adding a public API solely for an invariant.
  */
 const install: InvariantInstaller = () => {}