feat(instagram): add native DM adapter

[bensabic]

Adds a first-party Instagram Direct Messages adapter backed by Meta's Instagram API with Instagram Login.

• Verifies webhook challenges and HMAC signatures, then normalizes DMs, story replies, media, quick replies, postbacks, and reactions.
• Sends plain text, cards, quick replies, typing indicators, URL attachments, and uploaded media through graph.instagram.com.
• Maps authentication, rate-limit, and 24-hour messaging-window failures to typed adapter errors.
• Registers Instagram in the adapter catalog, CLI scaffold, official docs, replay suite, and Next.js example.

Usage

import { createInstagramAdapter } from "@chat-adapter/instagram";
import { Chat } from "chat";

const bot = new Chat({
  userName: "mystore",
  adapters: { instagram: createInstagramAdapter() },
});

Webhook

export async function POST(request: Request) {
  return bot.webhooks.instagram(request);
}

Verification

• pnpm --filter @chat-adapter/instagram test
• pnpm --filter @chat-adapter/instagram typecheck
• pnpm --filter example-nextjs-chat typecheck
• pnpm --filter example-nextjs-chat build
• pnpm check
• pnpm konsistent

Live Testing

Closes #729 / Co-Authored by @ivandujaut

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Project	Deployment	Actions	Updated (UTC)
chat	Ready	Preview, v0	Aug 2, 2026 9:56am
chat-sdk-nextjs-chat	Ready	Preview	Aug 2, 2026 9:56am