Update to Sandcastles

{
  "description": "Get channel recommendations based on your existing watchlist",
  "included_files": [],
  "name": "channels-suggest",
  "skill_md_contents": "---\nname: channels-suggest\ndescription: Get channel recommendations based on your existing watchlist\n---\nRecommend channels for me to follow based on the channels I already have in my watchlist. Use the `discover_channels` tool with no `query` parameter — this triggers recommendation mode based on my existing watchlist. Present the recommendations as a list, organized by category if there's natural grouping. Use channel descriptions intelligently to explain why each fits.\n"
}