Fix water misclassification and reduce detection hallucinations.

Restore union-based detection fusion for higher recall.

Fix AdaptFormer on production: pin protobuf and expose model health in /health

Fix detection precision: gated fusion, strict registration, calibrated thresholds, preload model

Improve building detection: fix tile size to 256, lower thresholds, add SSIM, smarter scoring

Fix: add trust_remote_code=True for AdaptFormer custom model code

Production overhaul: pre-trained AdaptFormer model + detection quality improvements

Add Siamese U-Net training notebook and model inference integration