fix: eval_drawings.py — correct template pairings and document baselines

fix: eval_drawings.py uses test_2.png (correct resistor template path)

feat: VLM recall-boost mode + reject-only (blacklist) filter

feat: optional VLM Stage-3 (Qwen2-VL-2B) semantic FP filter

feat: scale-invariant DINODense verifier path + remove CLIP prototype

feat: Zero-shot pattern detection pipeline for engineering BOM drawings