test(webapp): drive global-scope idempotency guard through real Redis + andWait cross-DB assertion

Replace the in-memory claim buffer with a real MollifierBuffer over a Redis
testcontainer, so the claim's SETNX arbitration / poll / publish run for real
(not a Map stand-in). Add a case where the claim loser is an andWait
(resumeParentOnCompletion) trigger whose parent lives on the other run-ops DB:
asserts one child AND that resolveWinnerAcrossDbs found the winner cross-DB and
wired the loser's parent onto the winner's run waitpoint.

Author: d-cs