Record YOLOv8s e60 candidate evaluation
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# Changelog
## Sprint 145 YOLOv8s hardneg r8 e60 full candidate evaluation (2026-07-08)
- Completed the Tower-local YOLOv8s hard-negative r8 training run through 60 CPU epochs and published local model asset `geointel-building-yolov8s-hardneg160r8e60-pt`.
- Ran the full 7-AOI positive matrix, hard-negative matrix, evidence portfolio and promotion report for the completed e60 artifact.
- Result: the model is rejected. It reduces Kasterlee-bos background detections versus `expanded160e50` at threshold `0.15` (`11` versus `46`), but mean positive F1 remains too low (`0.07870592446136859` at threshold `0.15`).
- No backend API, migration, frontend runtime, model download, provider-fetching behavior or active model configuration changed.
## Sprint 144 YOLOv8s hardneg r8 partial candidate evaluation (2026-07-08)
- Started a Tower-local YOLOv8s training run on the `yolo-building-tile-hardneg160r8` dataset with requested 60 epochs.