- Updated the expected default email channel in the `TestDefaultEmailChannel` test from "email" to "default" to align with recent configuration changes, ensuring accurate test validation.
- Added `robot_email` field to the Robot structure for specifying the sender's email address in email communications.
- Updated the EmailTarget structure by removing the CC field, simplifying the configuration for email targets.
- Revised TECHNICAL.md to include details on the new `robot_email` field and its usage in email delivery, ensuring clarity on the sender identity.
- Enhanced the Delivery Center's email handling to utilize the Robot's email as the From address, with a fallback to the provider's default if not configured.
- Updated DESIGN.md to reflect changes in email delivery architecture and added new sections for global email configuration.
- Marked completion of related tasks in TODO.md, confirming the integration of new email features and structures.
