雙管齊下 — two pipes simultaneously (agentic reframe: generator + discriminator)

**雙管齊下** (shuāng guǎn qí xià) — literally "two pipes / brushes drawn simultaneously". Classical reading: parallel-cooperative effort on the same goal. **Agentic reframe: the two pipes are ADVERSARIAL** — one generates the deliverable; the other actively attacks it, looking for what's wrong before reality finds it for you.