feat: add Signal adapter

[sudodaksh]

Summary

Adds @chat-adapter/signal — a new adapter for Signal bots powered by signal-cli-rest-api.

Supports send/edit/delete, reactions, typing indicators, file attachments, DM and group threads, and three receive modes (webhook, WebSocket via json-rpc, REST polling). Identity canonicalization handles phone/UUID/source aliases. Message truncation at 4096 chars.

Chat SDK core changes

• chat.openDM() now infers Signal adapter from signal:-prefixed IDs and E.164 phone numbers
• Message deduplication key includes edit revision suffix so edited messages aren't swallowed as duplicates

Also included

• Example app wiring in examples/nextjs-chat
• 8 standalone local testing scripts in examples/signal-local/
• Setup guide in README (Docker, device linking, registration, captcha handling)
• Changeset for @chat-adapter/signal (minor) and chat (minor)

Test plan

• pnpm validate passes (full monorepo lint + typecheck + tests + build)
• @chat-adapter/signal: 18 unit tests covering webhook parsing, edit dispatch, polling, sync messages, identity alias stability, group normalization, init failure modes, CRUD operations, and HTTP error mappings
• chat: 60 tests pass including new Signal DM inference and edit deduplication tests
• Manually tested against local signal-cli-rest-api (json-rpc/WebSocket): send, edit, delete, reactions, typing, DM + group echo bot
• Manually tested all 8 examples/signal-local/ scripts

[vercel]

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	dotenv@​16.6.1

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