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Restore the `fullyparallel: false` override for the unsharded `Postgres with binary parameters` and `Postgres FIPS` jobs in the weekly workflow. The override was originally added to the binary parameters job in #35995 to prevent resource exhaustion on a single runner, but was dropped when both jobs moved into server-ci-weekly.yml in #36036, leaving them on the template default of `true`. Without it, the hosted runner is overwhelmed (too many server instances, WebSocket hubs, and DB connections) and the runner agent itself loses communication with GitHub mid-run, surfacing as "hosted runner lost communication with the server" at ~55-60 min into the Run Tests step. Both runs on April 27 and May 4 failed this way; the sharded FIPS variant retained for FIPS-touching PRs in server-ci.yml is unaffected because each shard handles only a fraction of the packages. Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>