Update to Kreel

{
  "name": "kreel-next-test-briefing",
  "description": "Brief the next creative batch based on current performance.",
  "included_files": [],
  "skill_md_contents": "---\nname: kreel-next-test-briefing\ndescription: \"Brief the next creative batch based on current performance.\"\n---\n\nIf more than one brand is reachable, call `list_brands` first and pass `brand` on every call.\n\nBrief the next creative test. Use `get_creatives` (date_range={\"days\": 30}) to see what's live, `get_performance` to see what's winning. Recommend 3 new creative angles to test, why each, and which existing creative each replaces.\n"
}