You merge the PR. The build passes. The code does what you expected it to do. You move on.
That is review for most engineers. A final read. A feeling that things looked right before the branch closed.
I did it the same way for years.
Three phases had already run before this one. Think had scoped the work, Plan had written the requirements, Build had shipped a diff that matched the plan exactly. I trusted that the chain held. I had never actually checked.
Then I ran the Review phase, and checking turned out to mean something specific: not does this work, but does this requirement hold up, and what is my evidence.
