{
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      "message_short": "LOW tier (direct straddle)",
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      "interval_to": null,
      "strike": null,
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      "message_long": "Expiry rejected: insufficient_strikes",
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    {
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      "strike": null,
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      "message_short": "Rejected: insufficient_strikes",
      "message_long": "Expiry rejected: insufficient_strikes",
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    "build_metadata": {
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      "max_horizon_label": "8w_liquid",
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      "notes": "UI clamps horizon; avoid LEAPS/illiquid expiries beyond 8 weeks"
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    "ui_capabilities": {
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      "id_namespace": "market_calendar",
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}