test(cutover): the ui pin test drops the readWorkspace import it no longer uses (bill item 47, objectstack#25803)

Patch 61 retargeted ui/scripts/__tests__/objectstack-pin.test.ts to the
merged workspace and left `readWorkspace` imported but unused; the ui
`lint:root` lane (object-ui/no-unused-imports) refuses that as an error,
so run 4's Lint UI went red on this one line. Measured: ui ESLint on the
file 0, the test 38/38, `pnpm --dir ui run lint:root` 0 errors (33
warnings, all pre-existing no-explicit-any).

Co-Authored-By: Claude <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RSDL3SFtJaKzcymvCD8RsU

Author: claude

ui/scripts/__tests__/objectstack-pin.test.ts

@@ -51,7 +51,6 @@ import {
   tailLines,
   readOverrides,
   readPin,
-  readWorkspace,
   runtimeClosure,
   workspaceGlobs,
 } from '../objectstack-pin.mjs';