Chat SDK adds Photon support

Short summary

Vercel's Chat SDK now supports Photon via a new .vendor-official adapter, enabling developers to build bots that send and receive iMessages including group chats, media sharing, and native tapbacks. Each Photon conversation maps to a Chat SDK thread with reactions, handlers, and subscriptions working like any other adapter. Bots can run against Spectrum Cloud, a self-hosted server, or directly on a Mac, with HMAC-verified webhooks allowing replies without a live connection.

• •Chat SDK adds Photon .vendor-official adapter for iMessage bot support
• •Photon conversations map to Chat SDK threads; tapbacks become reactions
• •Webhooks are HMAC-verified; bots can reply to DMs without a live connection

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