How does Verified CM's signal system work for categorizing contracts and assigning status colors?

Verified CM's signal system categorizes contracts into three states:

Unregistered (Light Gray) - These contracts have either been sent via email or uploaded to Verified CM but have not yet undergone review or registration. Such contracts are only in the Inbox and have no associated tasks.

Active (Green, Yellow, or Red) -These contracts have been registered in the system and are currently in force. The color coding for these contracts is based on the tasks that need to be performed and can give three different statuses:

Green: Used either before a task is started or if there are no tasks associated with the contract.

Yellow: Used from the date a task starts until its end date.

Red: Used when the deadline to complete a task has been exceeded.

Finished (not active) (Black) -These contracts were previously active but have since been terminated. Although they are archived in Verified CM and no new tasks can be added, previous tasks are retained for archiving purposes. A contract is marked as "not active" when it is marked as completed by the user.