How do you determine that a task in a project is fully completed and ready for handover or closure?

The task is considered fully completed and ready for handover or closure if the following criteria are met:

• All requirements of the task are implemented according to the technical specifications.
• The code is covered by necessary tests (unit tests, integration tests) and they pass successfully.
• Code review has been conducted and comments have been addressed.
• The application or module operates without errors in the intended scenarios.
• The task documentation is updated (if required).
• The task is integrated into the main branch of the project and successfully passes build and deployment (if applicable).

For example, when developing a function in Python, I check that all functions work correctly, tests cover the main cases, and the code is understandable to other developers.