tooling(cutover): check:pnpm-flag-spellings names the ui/ manifests in its watch hints (objectstack#25803)

Bill item 21(a), fifth population declaration: the self-test holds DECLARED_WATCH_HINTS against
every tracked package.json, and the merged tree adds the objectui manifests under ui/. Spelled
as git-merge-regen.mjs spells the same population. Declaration only; the scan already reads
every manifest.

Co-Authored-By: Claude <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CUXv64KLMfYv3ia2sWi6te

Author: claude

scripts/check-pnpm-flag-spellings.mjs

@@ -189,6 +189,8 @@ const DECLARED_WATCH_HINTS = [
   'packages/**/package.json',
   'apps/**/package.json',
   'examples/**/package.json',
+  // The objectui tree under `ui/` (objectstack#25677), as git-merge-regen.mjs spells it.
+  'ui/**/package.json',
 ];
 
 /** The file that owns this rule, and so is not judged by it (see the header). */