Raindrop.io bookmarks and collections in Pi.

pi install https://github.com/goofansu/pi-raindrop

• RAINDROP_API_KEY: a Raindrop.io API key or test token.
• secretspec CLI, for make dev only.

• raindrop tool: get, create, and update bookmarks, and list collections.
• raindrop skill: workflow guidance for bulk updates and background metadata parsing.