test(spec): run the owner/hidden retirement pin under the repo project

Its tree-scoped walk reads outside packages/spec, so it belongs in
vitest.repo-tests.json, whose hash moves with the declared radius
(check:cross-package-test-inputs).

Claude-Session: https://claude.ai/code/session_01Rjy9MeetSfq34PKn81CRiN
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

packages/spec/vitest.repo-tests.json

@@ -30,5 +30,6 @@
   "src/system/compliance-families-retirement.test.ts",
   "src/system/constants/platform-object-names.test.ts",
   "src/system/email-template-floor-locale-parity.pin.test.ts",
-  "src/ui/action-requires-confirmation-docblock.pin.test.ts"
+  "src/ui/action-requires-confirmation-docblock.pin.test.ts",
+  "src/ui/view-item-owner-hidden-retirement.test.ts"
 ]