test: run suite without split runner

src/shared/model-resolution-pipeline.test.ts

@@ -1,13 +1,6 @@
-import { describe, expect, mock, test } from "bun:test"
+import { describe, expect, test } from "bun:test"
 import { resolveModelPipeline } from "./model-resolution-pipeline"
 
-// Force test-runner isolation: files that import mock.module are auto-detected
-// by run-ci-tests.ts and executed in their own bun process so they cannot be
-// contaminated by (or contaminate) mock.module calls in other test files.
-mock.module("./logger", () => ({
-  log: () => {},
-}))
-
 describe("resolveModelPipeline", () => {
   test("does not return unused explicit user config metadata in override result", () => {
     // given