Repair Thermal browser and authoritative planning

Work in the real product frontend and the transactional backend. Integrate only the positive area of linearly interpolated temperature above threshold, including crossings inside sample intervals. All carriers need certification when requested. The UI accepts transit duration, while the API accepts exclusive end time. Charge ceiling transit hours and count confirmed transit minutes only. The board-to-API adapter and an authoritative planning guard both contain defects. The browser workflow and direct API checks must agree on the same contract. Run bash test/run.sh. The public checks drive Chromium against native HTTP and a real database; each scoring group includes regression safeguards.

Work with the stack you want to practice. Your workspace and timer start after you choose.