Add adaptive TP/FP/FN validation mosaic export (#2271)
- remove top-level cv2/annotator imports; lazy-load inside rendering functions
- remove save_result_images bool; save_directory_path is now keyword-only after metric_target
- drop hardcoded result/ subdirectory from benchmark output path
- propagate metric_target into _split_detections_by_outcome for correct OBB IoU dispatch
- add filename collision UserWarning in benchmark loop
- remove dead/unreachable combined None-check in _split_detections_by_outcome
- add Google-style docstrings to all 5 new private visualization functions
- add TestSplitDetectionsByOutcome covering 7 edge cases (empty inputs, cross-class, confidence-None)
- fix FP/FN pixel assertions to check interior box pixels rather than border/title regions
- fix benchmark_a_model.md: full panel names, add Visual Benchmarking section, update API examples
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