{
  "version": "oracle-reader-diagnostic-v1",
  "reason": "Two excluded development QA cases showed source-turn hits without full answer correctness; isolate reader limitations before interpreting retrieval gains.",
  "selection": "All 42 already-selected public test cases, no score-based selection.",
  "input": "Only original sessions identified by official evidence_session labels, with full session content. No reference answer or has_answer metadata is supplied to reader. Abstention rows have no evidence and are reported separately.",
  "reader": "Same model, system prompt, output limit and final question as A-D, but oracle evidence selection and potentially different context length.",
  "use": "Diagnostic reader reference only. Not an implementable retrieval method, not a fifth competing retrieval score, not an official leaderboard result.",
  "frozen_primary_protocol": "protocol.json and A-D results remain unchanged."
}