This commit adds more granular control over group activation with new modes:
- 'replies': Bot only responds when someone replies to one of its messages
- 'mention+replies': Bot responds to @mentions OR replies (most flexible)
- 'never': Bot never responds except for control commands from owners
The existing 'mention' (default) and 'always' modes remain unchanged.
**Implementation details:**
- Added new GroupActivationMode types: 'replies', 'mention+replies', 'never'
- Enhanced group-gating logic to detect replies to bot messages
- Updated all command help messages and documentation
- Reply detection uses both JID and E.164 matching for reliability
**Use cases:**
- 'replies': Reduces noise in busy groups, bot only joins when explicitly engaged
- 'mention+replies': Allows natural conversation flow after initial @mention
- 'never': Temporarily disable bot in a group without removing it
Closes: N/A (feature request)
Self messages from the linked WhatsApp number bypass dmPolicy and allowFrom
checks automatically. Clarified that users don't need to add their own
number to the allowlist.
Self messages from the linked WhatsApp number bypass dmPolicy checks
entirely (via isSamePhone check in access-control.ts)...
