{
  "$comment": "发现合同（专题-09 §4.2，含 U0 修正 #2 arbitration_note 与 #3 context_window 规格）。spans 为多点结构：密度/语义层的分布式命中逐点登记。",
  "type": "object",
  "required": ["id", "text_hash", "rule_id", "rule_version", "spans", "context_window", "layer", "evidence", "possible_function", "confidence", "decision_proposal"],
  "properties": {
    "id": {"type": "string", "minLength": 1},
    "text_hash": {"type": "string", "minLength": 7},
    "rule_id": {"type": "string"},
    "rule_version": {"type": "integer"},
    "spans": {"type": "array", "minItems": 1, "items": {"type": "string", "minLength": 1}},
    "context_window": {"type": "string", "$comment": "span 前后各 12 字符，换行转空格（config context_window_chars）"},
    "layer": {"type": "string", "enum": ["mechanical", "lexical", "structural", "density", "semantic"]},
    "evidence": {"type": "string", "minLength": 2},
    "possible_function": {"type": "string", "$comment": "none / unknown / 具名功能 / pending_arbitration"},
    "confidence": {"type": "string", "enum": ["high", "medium", "low", "candidate"]},
    "decision_proposal": {"type": "string", "enum": ["repair", "keep", "ask", "pending"]},
    "arbitration_note": {"type": "string"},
    "carrier": {"type": "string", "enum": ["narration", "dialogue", "monologue", "in_text_carrier", "mixed", "unknown"]},
    "default_disposition": {"type": "string", "enum": ["blocking", "candidate", "advisory"]},
    "carve_out_candidates": {"type": "array", "items": {"type": "string"}}
  }
}