fix(whatsapp): enable reactions in group chats

[mcinteerj]

Summary

This PR enables the agent to successfully send reactions in WhatsApp group chats by solving two critical issues:

1. Metadata Preservation: Group history now stores uid=501(jakemc) gid=20(staff) groups=20(staff),12(everyone),61(localaccounts),79(_appserverusr),80(admin),81(_appserveradm),33(_appstore),98(_lpadmin),100(_lpoperator),204(_developer),250(_analyticsusers),395(com.apple.access_ftp),398(com.apple.access_screensharing),399(com.apple.access_ssh),400(com.apple.access_remote_ae),701(com.apple.sharepoint.group.1) (message ID) and for historical messages. These are injected into the group context sandwich as [message_id: ...] hints so the agent can reference them.
2. JID Normalization: The WhatsApp reaction tool now correctly normalizes participant phone numbers (e.g., +6421...) to JIDs (6421...@s.whatsapp.net) before sending to the server.

Related

• Build on top of fix(whatsapp): use RawBody for command detection in group chats #639 (Fixes command detection in groups via RawBody).
• Addresses a specific metadata requirement discussed in RFC: Structured MsgContext and Decomposition of CombinedBody #638 (RFC: Structured MsgContext).

Changes

• src/web/auto-reply.ts:
  • Updated groupHistories map to store id and senderJid.
  • Injected [message_id: ID] into stringified group history context.
• src/web/inbound.ts: Normalizes the participant JID in sendReaction using toWhatsappJid.
• src/web/monitor-inbox.test.ts: Added unit test for JID normalization in reactions.

Testing

Verified that sendReaction now receives a correctly formatted JID. Tested group history injection logic.

[steipete]

Landed via temp rebase onto main.\n\n- Gate: pnpm lint (fails on main formatting in bash-tools/sandbox-explain/cli files), pnpm build, pnpm test\n- Land commit: 7e6fa94\n- Merge commit: ec10475\n\nThanks @mcinteerj!