Add Telnyx SMS/MMS adapter

[haydenbleasel]

Summary

• Adds @chat-adapter/telnyx for SMS/MMS messaging via Telnyx API
• Supports inbound webhook handling with Ed25519 signature verification and replay attack prevention
• Outbound SMS with automatic MMS upgrade when attachments have public URLs
• Rate limit handling (429), structured Telnyx error parsing, and all inbound messages treated as mentions
• Full docs page + feature matrix updates on the adapters overview

Test plan

• pnpm --filter @chat-adapter/telnyx test — 42 tests pass
• pnpm validate — full monorepo validation passes
• Docs build successfully with new Telnyx adapter page
• Verify Telnyx adapter page renders at /docs/adapters/telnyx
• Verify feature matrix tables on /docs/adapters include Telnyx column

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
chat	Ready	Preview, Comment, Open in v0	Mar 8, 2026 0:10am