- Move config from messages.ackReaction to whatsapp.ackReaction
- New structure: {emoji, direct, group} with granular control
- Support per-account overrides in whatsapp.accounts.*.ackReaction
- Add Zod schema validation for new config
- Maintain backward compatibility with old messages.ackReaction format
- Update tests to new config structure (14 tests, all passing)
- Add comprehensive documentation in docs/providers/whatsapp.md
- Timing: reactions sent immediately upon message receipt (before bot reply)
Breaking changes:
- Config moved from messages.ackReaction to whatsapp.ackReaction
- Scope values changed: 'all'/'direct'/'group-all'/'group-mentions'
→ direct: boolean + group: 'always'/'mentions'/'never'
- Old config still supported via fallback for smooth migration
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