Goal: let Clawd sit in WhatsApp groups, wake up only when pinged, and keep that thread separate from the personal DM session.
## What’s implemented (2025-12-03)
- Mentions required by default: real WhatsApp @-mentions (via `mentionedJids`), regex patterns, or the bot’s E.164 anywhere in the text all count.
- Group allowlist bypass: we still enforce `allowFrom` on the participant at inbox ingest, but group JIDs themselves no longer block replies.
- Per-group sessions: session keys look like `group:<jid>` so commands such as `/verbose on` or `/think:high` are scoped to that group; personal DM state is untouched. Heartbeats are skipped for group threads.
- Context injection: last N (default 50) group messages are prefixed under `[Chat messages since your last reply - for context]`, with the triggering line under `[Current message - respond to this]`.
- New session primer: on the first turn of a group session we now prepend a short blurb to the model like `You are replying inside the WhatsApp group "<subject>". Group members: +44..., +43..., … Address the specific sender noted in the message context.` If metadata isn’t available we still tell the agent it’s a group chat.
- The regexes are case-insensitive; they cover `@clawd`, `@clawd uk`, `clawdbot`, and the raw number with or without `+`/spaces.
- WhatsApp still sends canonical mentions via `mentionedJids` when someone taps the contact, so the number fallback is rarely needed but is a good safety net.