feat(nli): fb-41 PR-9a — kebab-nli crate skeleton + workspace deps
- 신규 crate kebab-nli (trait + impl 동일 crate, v0.18 scope = ONNX adapter 1개).
- NliVerifier trait + NliScores struct (XNLI 3-channel: entailment/neutral/contradiction).
- private softmax3 (log-sum-exp 안전).
- OnnxNliVerifier placeholder (PR-9b 가 ONNX inference + model download 추가).
- workspace.dependencies 추가: ort 2.0-rc.9, tokenizers 0.21 (default-features=false, onig), hf-hub 0.4, ndarray 0.16.
Pre-flight (PR-9 design contract 의 gate):
- HF Xenova/mDeBERTa-v3-base-xnli-multilingual-nli-2mil7 model.onnx + tokenizer.json → HTTP/2 302 (HF S3 routing, file 존재).
- tokenizers --no-default-features -F onig 의 standalone repro: SentencePiece mDeBERTa tokenizer.json 로드 OK (KR 9 tokens / EN 11 tokens 정상 encode).
- Cargo features 결정 trace: tokenizers = { default-features = false, features = ["onig"] } lock.
Tests: 6 unit (softmax3 정규화 + 불변성 + XNLI logits 변환 + faithfulness + new + score stub) — 통과.
Verification: cargo test -p kebab-nli -j 1 (6/6) + cargo clippy -p kebab-nli --all-targets -j 1 -- -D warnings clean.
Workspace: cargo test --workspace -j 1 — pre-existing kebab-mcp::tools_call_ask_multi_hop 1 fail (main baseline 동일 fail, PR-9a 무관 — ingest fixture/Ollama 의존 flaky).
Wire 영향: 없음 (crate 도입만).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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