Implement shared-number detection in reserveOutreachSend: reject manual WhatsApp sends with HTTP 409 when the destination number is shared across 2+ leads and hasn't been explicitly released via override.
- Add test: reserveOutreachSend bloqueia numero compartilhado sem override e libera com override
- Add check in reserveOutreachSend right after isOptedOut check
- Uses isNumberSharedAcrossLeads and isSharedNumberOverridden from Task 1
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
GustavoandClaude Sonnet 5
3d2144eefc