"""Evidence-gated origin resolution; CST digits are never an origin source."""


def resolve_origin(product_id: str, aggregate: dict, kb_facts: dict) -> dict:
    if aggregate.get("conflict_count", 0):
        status = "ORIGIN_CONFLICT"
    elif aggregate.get("strong_evidence") and aggregate.get("value") in {str(i) for i in range(9)}:
        status = "ORIGIN_CONFIRMED"
    else:
        status = "ORIGIN_NEEDS_EVIDENCE"
    return {
        "product_id": product_id,
        "status": status,
        "value": aggregate.get("value") if status == "ORIGIN_CONFIRMED" else None,
        "provenance": aggregate.get("provenance", []),
        "reason": "explicit supplier observations only; CST digit ignored",
    }