{
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      "target_key": "2026-09-29",
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    "build_metadata": {
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      "diagnostics_level": "lite",
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    "ui_limits": {
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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",
      "id_format": "CATEGORY_YYYYMM",
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}