petrol-fastwin-v6 (INT8 + WBF + agreement gate)

Same approach as v5, with INT8 dynamic quantization to fit the 30 MB repo size limit for manak0/Detect-petrol-station-1-0.

• weights/havengo.onnx — INT8 quantized (22.7 MB → 11.6 MB)
• weights/superbit.onnx — INT8 quantized (19.4 MB → 10.1 MB)
• Total: 21.8 MB (limit 30 MB)

WBF ensemble + cluster-agreement gate (both models must propose a box within WBF IoU 0.55) — the +12.2% composite recipe from v5.