vat3-24k: publish milestone-3 full-VAT checkpoint (mixed verdict) + registry row

docs: Current-trunk pointer + registry.json link

docs: training-pass column in registry index (phase labels as metadata, not names)

docs: registry-index model card (multi-milestone scope; naming-change pointer)

docs: lowercase Reference/models in consumption steps (workspace convention)

docs: refresh model card (provenance, consumption) + ship engine config.json

feat: add LiteRT split-graph lane (litert-torch, mobile/delegate-ready)

feat: add weights-only-fp16 / f32-I/O artifact (mobile-recommended)

fix: re-export TFLite artifacts with corrected encoder LayerNorm

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initial commit