When a new robot arm changes joint names, camera topics, or control frequency, a failed demo tends to get blamed on the policy. The logs may show something much less interesting: an adapter mapped a valid action into the wrong device convention. Claude Opus 4.8 could read the SDK docs and draft the adapter, schema checks, and a small replay test. LingBot-VLA 2.0 stays on the policy side instead of being asked to paper over the device mismatch. Limits, timing, and emergency behavior still hav...