model: deploy round-3 vest-boost fine-tune

Real-world vest detection on 84 held-out images (never seen in training):
baseline 0.0% -> round 2 24.8% -> round 3 50.5% recall @ conf 0.25
Non-vest classes held: hardhat 0.934, no-hardhat 0.965, person 0.915.

ppe_yolo11s.onnx

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