curl --request POST \
  --url https://api.alpha-1edtech.ai/goals/{studentId}/subjects/preview \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "subject": "Reading",
  "objective": {
    "type": "grade_mastery",
    "value": "<string>"
  },
  "pacing": {
    "mode": "target_date",
    "endDate": "<string>",
    "dailyTargetXP": 123
  }
}
'

{
  "preview": {
    "subject": "<string>",
    "goal": {
      "type": "grade_mastery",
      "objective": {
        "type": "grade_mastery",
        "value": "<string>"
      },
      "pacing": {
        "mode": "target_date",
        "endDate": "<string>",
        "dailyTargetXP": 123
      }
    },
    "execution": {
      "stageId": "<string>",
      "courseIds": [
        "<string>"
      ]
    },
    "computed": {
      "xp": {
        "total": 123,
        "earned": 123,
        "remaining": 123,
        "pctComplete": 123
      },
      "pace": {
        "requiredDailyXP": 123,
        "effectiveDailyXP": 123,
        "schoolDaysRemaining": 123
      },
      "projection": {
        "currentGrade": "<string>",
        "daysToNextGrade": 123,
        "gradeTimeline": [
          {
            "grade": "<string>",
            "remainingXP": 123,
            "daysToComplete": 123,
            "projectedDate": "<string>",
            "status": "completed",
            "totalXP": 123,
            "earnedXP": 123,
            "courseIds": [
              "<string>"
            ]
          }
        ]
      },
      "resolution": {
        "strategy": "percentile",
        "resolvedTargetGrade": "<string>",
        "targetRit": 123
      },
      "issue": {
        "code": "missing_starting_grade",
        "message": "<string>",
        "service": "<string>",
        "path": "<string>",
        "status": 123
      }
    }
  }
}