{
  "context": "Evaluates whether the timeline planner uses temporal-polyfill arithmetic and comparison helpers (add, until, round, compare) on Temporal types. Confirms timezone-aware ISO handling is implemented without manual date math or naive string operations.",
  "type": "weighted_checklist",
  "checklist": [
    {
      "name": "Temporal parsing",
      "description": "Parses input ISO strings (with offsets/zones) into Temporal.ZonedDateTime or Instant objects via Temporal.ZonedDateTime.from/Temporal.Instant.from instead of manual string manipulation.",
      "max_score": 20
    },
    {
      "name": "Segment addition",
      "description": "Builds cumulative segment endpoints by applying Temporal.Duration.from(...) values with the add method on a Temporal date-time type, preserving the original time zone through each step.",
      "max_score": 25
    },
    {
      "name": "Gap difference",
      "description": "Calculates the gap between end and next-start using until/since on Temporal objects and converts that Duration to whole minutes (e.g., via total({ unit: 'minutes' })) instead of subtracting milliseconds manually.",
      "max_score": 20
    },
    {
      "name": "Checkpoint rounding",
      "description": "Rounds checkpoints with the round helper on a Temporal date-time value using minute increments and a half-expand/half-up mode (matching Temporal's default) rather than custom arithmetic.",
      "max_score": 20
    },
    {
      "name": "Earliest comparison",
      "description": "Determines the earliest moment by comparing Temporal instances with compare/equals on Instant or ZonedDateTime (or by converting to Instant) instead of ordering ISO strings lexicographically.",
      "max_score": 15
    }
  ]
}