feat: unify group policy allowlists

docs/group-messages.md

@@ -11,7 +11,7 @@ Note: `routing.groupChat.mentionPatterns` is now used by Telegram/Discord/Slack/
 
 ## What’s implemented (2025-12-03)
 - Activation modes: `mention` (default) or `always`. `mention` requires a ping (real WhatsApp @-mentions via `mentionedJids`, regex patterns, or the bot’s E.164 anywhere in the text). `always` wakes the agent on every message but it should reply only when it can add meaningful value; otherwise it returns the silent token `NO_REPLY`. Defaults can be set in config (`whatsapp.groups`) and overridden per group via `/activation`. When `whatsapp.groups` is set, it also acts as a group allowlist (include `"*"` to allow all).
-- Group allowlist: `whatsapp.groups` gates which group JIDs are allowed; `whatsapp.allowFrom` still gates participants for direct chats.
+- Group policy: `whatsapp.groupPolicy` controls whether group messages are accepted (`open|disabled|allowlist`). `allowlist` uses `whatsapp.groupAllowFrom` (fallback: explicit `whatsapp.allowFrom`).
 - Per-group sessions: session keys look like `whatsapp: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]`.
 - Sender surfacing: every group batch now ends with `[from: Sender Name (+E164)]` so Pi knows who is speaking.