How do I explain a gap in my CV when I could not work due to visa restrictions?

My situation:n

• Six-month gap between Student visa expiry and Graduate route activation
• Could not take paid work during this period
• Not sure whether to address it directly or hope employers do not notice

nnQuestions for the community:n

• How do you frame a visa-related gap positively?
• Is it better to address it proactively in a cover letter or wait until interview?
• What language has worked well?

nnUKBuddy CV and Cover Letter Guide