"projects/playground": Update w.r.t CL #7951
"projects/playground": Update w.r.t CL #7951

See: https://vanadium-review.googlesource.com/#/c/7951/
Change-Id: I83e08c1c69d4c6868ce4aba11c72cf691fad5df6

vanadium/playground,vanadium/playground,vanadium/playground,vanadium/playground