chore: sync bun.lock with the @wrnexus/ui package version

The lockfile recorded @wrnexus/ui at 0.8.13 while its manifest is 0.8.15, so
validate:0.8 failed its workspace version check. The drift predates this branch
and is present on main; bun install does not rewrite workspace metadata that is
already satisfied, so this applies the same targeted rewrite the release
tooling performs in syncWorkspaceLock. No version is bumped.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

bun.lock

@@ -617,7 +617,7 @@
     },
     "packages/ui": {
       "name": "@wrnexus/ui",
-      "version": "0.8.13",
+      "version": "0.8.15",
       "dependencies": {
         "@wrnexus/core": "workspace:*",
       },