MANUAL RUN: Workers Logs drop query strings after a deploy (redactQueryString via Alchemy) #4104

About 10 minutes. Do this after the PR that closes #2578 merges.

worker.redactQueryStrings now goes up with the Worker as Alchemy's observability.redactQueryString (Alchemy beta.84). The step that used to patch it after each deploy is gone. This live check confirms that Cloudflare keeps the setting after an upload.

Steps:

1. On main, deploy codeSplitter, which sets redactQueryStrings: true. Use the usual flags: cd apps/codesplitter && DEPLOYS=1 AGENTS=1 CHECKS=1 bunx rustybuns deploy.
2. Open any codeSplitter URL with a query string, e.g. https://<codesplitter host>/?probe=redact-check.
3. In the Cloudflare dashboard, open Workers & Pages > codesplitter > Logs, and find that request.
4. Yes if the logged URL has no ?probe=redact-check. No if the query string is still there. In that case, also check Settings > Observability: does it say query strings are redacted?

Part of #605.