chore(credits): list @zhuowp among the unreleased contributors

#7016, #7018 and #7019 from @asto18089 carry a Co-authored-by trailer for
@zhuowp (the work was ported from a fork they contributed to).
scripts/check-contributor-credit.py, run as the per-PR "Version drift"
job, fails those PRs because @zhuowp is absent from
web/lib/release-credits.ts. docs/CONTRIBUTORS.md and CHANGELOG.md already
credit them. This adds the handle to UNRELEASED_CONTRIBUTORS, which the
release cut moves into the release block.

Refs #7016
Refs #7018
Refs #7019

Verified: python3 scripts/check-contributor-credit.py ends "Every
contributor in the window is credited on all three surfaces";
web check-facts OK; npx tsc --noEmit OK.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01NBKbhx19BRbZtvWK8rVKjz

web/lib/release-credits.ts

@@ -39,6 +39,7 @@ export const RELEASE_CONTRIBUTORS: string[] = [
  * cut moves them into RELEASE_CONTRIBUTORS with that release's changelog block.
  */
 export const UNRELEASED_CONTRIBUTORS: string[] = [
+  "@zhuowp",
 ];
 
 /**