Greptile Summary

This PR adds pool: "forks" to the gateway-server Vitest project config, switching from the default threads pool to a forks (child-process) pool. The createScopedVitestConfig helper already accepts and correctly propagates this option, so the change is a single-line, well-supported addition that measurably reduces peak RSS (~15%) with no regression in test count or elapsed time.

Confidence Score: 5/5

Safe to merge — purely a test-configuration change with no production code impact.

Single-line change to a Vitest config option that is already typed and handled in the shared config helper. No logic changes, no production code touched, and the PR provides benchmark evidence of the improvement.

No files require special attention.

_{Reviews (1): Last reviewed commit: "test(gateway): reduce server shard memor..." | Re-trigger Greptile}