~x-ai/grok-latest → A (4:1)

A extracts duplicated HTTP clients, mock Google OAuth, assert/ANSI harness, cargo-build, and server-env helpers into test.common/test.oauth and rewires auth/grants/integration to use them, which is lasting test design. B only deletes a few lines of already-dead zero-ratio guard in apply_vote and adjusts one unit test—correct hygiene, but far smaller lasting impact.