chore: update email to zestdapoet@gmail.com and push user changes

docs: add detailed HTML system specification (design_spec/system_spec.html)

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