PR #158 review-leftover: The upstream test file gains new fork-only tests (the omitUserEmail fixture op [6e4e6b308176] #159

[review-leftover] #158

• apps/server/src/provider/antigravityUsageLimits.test.ts:597 adds fork-only test coverage through the omitUserEmail fixture option and the unidentified and idOnly probe cases, while withAntigravityAccountEmail has no test file of its own in the fork directory. Move the fork-specific coverage into a dedicated test file there.