Generic NLI entailment endpoint, ZeroGPU-backed. Given a claim and one or more candidate source spans, returns whether the claim is entailed by the best-matching span. Fail-closed: no spans, malformed input, or low-confidence entailment all resolve to supported=false. Note: this Space sleeps when idle — the first call after idle can take ~30-60s (GPU attach). Warm it a few minutes before a live demo.