What's the easiest way in an app to let people create casts, without implementing a sign-up flow in the app? I thought AuthKit will let me do it but that's really just a SIWE replacement as far as I can tell

Take a look at https://warpcast.notion.site/Signer-Request-API-Migration-Guide-Public-9e74827f9070442fb6f2a7ffe7226b3c
Soon, Auth Kit will also be able to natively do that according to

Take a look at https://warpcast.notion.site/Signer-Request-API-Migration-Guide-Public-9e74827f9070442fb6f2a7ffe7226b3c
Soon, Auth Kit will also be able to natively do that according to https://warpcast.notion.site/Farcaster-Connect-Public-9b3e9fb7a4b74f158369796f3e77c1d3