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      "timestamp_distance_s": 0.5390000000000015
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    {
      "query": "q046",
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        "start_s": 56.0
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      "timestamp_distance_s": 0.5390000000000015
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    {
      "query": "q049",
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    {
      "query": "q050",
      "category": "hard-negative-confusion",
      "winner": "music01",
      "expected": [
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    {
      "query": "q059",
      "category": "unsupported-query-capability",
      "detail": "Production query API has no temporal-range filter yet"
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    {
      "query": "q060",
      "category": "no-answer-nearest-neighbor-return",
      "winner": "music01",
      "score": 0.01639344262295082
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    {
      "query": "q061",
      "category": "no-answer-nearest-neighbor-return",
      "winner": "music01",
      "score": 0.01639344262295082
    },
    {
      "query": "q062",
      "category": "no-answer-nearest-neighbor-return",
      "winner": "music01",
      "score": 0.01639344262295082
    },
    {
      "query": "q063",
      "category": "no-answer-nearest-neighbor-return",
      "winner": "clip04",
      "score": 0.01639344262295082
    },
    {
      "query": "q064",
      "category": "no-answer-nearest-neighbor-return",
      "winner": "clip04",
      "score": 0.01639344262295082
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    {
      "query": "q065",
      "category": "no-answer-nearest-neighbor-return",
      "winner": "clip04",
      "score": 0.01639344262295082
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  "source_scope": "Actual Searchi hybrid pipeline and native extension filters; temporal-range filter unsupported; segment ends inferred from configured audio/frame policy, exact point timestamps come from actual result API",
  "interpretation": "Small independently labelled public-media diagnostic; source_scope identifies the measured lane. No-answer return rate measures unsuppressed output, not a calibrated confidence policy. Audio interval overlap can pass while the returned start timestamp is too early; point hits expose this. This corpus alone cannot certify production quality."
}