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CI's test-shard.sh was including *.serial.test.ts files in the parallel shard runs, which broke voyage-multimodal.test.ts: 18 of its 22 tests failed in CI shard 2 because eval-takes-quality-runner.serial.test.ts ran before it in the same bun-test process and leaked its mock.module() substitution of src/core/ai/gateway.ts. The leaked mock omitted embedMultimodal and resetGateway, so voyage-multimodal saw `undefined is not a function` everywhere it touched the gateway. Locally `bun run test` (run-unit-parallel.sh → run-unit-shard.sh) already excludes *.serial.test.ts and runs them via `bun run test:serial` in their own pass with --max-concurrency=1. Master ran green there; only CI's matrix shards exposed the leak. The runner.serial test file's own header comment explicitly calls out this exact cross-file mock leak — the quarantine was the design, CI just wasn't honoring it. Three changes: 1. scripts/test-shard.sh — exclude *.serial.test.ts and *.slow.test.ts from the find expression, mirroring scripts/run-unit-shard.sh. 2. .github/workflows/test.yml — add a `test-serial` sibling job that runs `bun run test:serial`. Keeps serial tests gating CI without merging them back into the parallel shards. 3. test/scripts/test-shard.test.ts — regression test pinning the three exclusion clauses (serial, slow, e2e) so a future refactor that drops one of them fails loud rather than silently re-introducing the cross-file mock leak. Verified locally: - shard 2 reproduction: 18 voyage-multimodal failures → 0 (1 unrelated env-dependent perf flake remains, won't fail on CI) - bun run test:serial: 189/190 pass (1 unrelated env-dependent BrainRegistry flake from ~/.gbrain/config.json presence) - typecheck + check:test-isolation clean