fix: address reviewer feedback — qualify claims, fix AGENTS.md, add quantization caveat

fix: use num_labels=1 instead of num_classes=1

docs: restore OpenSight community validation and preview sections

docs: mention AGENTS.md for LLM tools, add benchmark Space section

docs: final README overhaul + CHANGELOG for July 2026 fix

docs: remove test_app references, update ONNX count to 5 variants

chore: require transformers >= 5.4.0 for shortest_edge resize support

docs: update README for num_classes=1 sigmoid output, correct verification

docs: overhaul README — fix notice, ONNX variant guide, test app, deprecate old ONNX repo

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Add project page and link to paper (#2)

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