Add YOLO preflight runtime diagnostics

docs/AI_PIPELINES.md

@@ -70,6 +70,10 @@ The preflight checks:
 - tile count against `YOLO_MAX_TILES`;
 - referenced tile file existence.
 
+JSON output also reports runtime diagnostics: whether dependencies were assumed,
+the configured model directory, `YOLO_CONFIG_DIR`, installed `torch` and
+`ultralytics` versions, and CUDA availability when dependency checks pass.
+
 The preflight does not load the model, does not import Ultralytics unless dependency discovery requires package metadata, does not run inference and never downloads model weights.
 
 Sprint 25 adds an explicit local model compatibility smoke: