project-engine.test.ts hand-writes a factory for ../merge/merger-ai.js, and
it had drifted from the module: WorkspaceMergeDispatchSupersededError was
missing. Production imports that class, so the merge-queue drain threw "No
<export> is defined on the mock" before the code under test ran — the four
Phase C hardening cases then failed on a resolved promise and an absent
updateTask call, for a reason unrelated to what they assert.
No product change. All 114 tests in the file pass.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2556083b68