Cross-SDK Consistency Review agent posts duplicate comments #982

In this repo we have the Cross-SDK Consistency Reviewer. Its comments are helpful, but it has an unfortunate behavior of posting many comments on each PR - typically one per commit, each repeating a large block of info. Example: #960

The excessive volume of comments makes PR review harder and makes genuine comments get lost.

Suggestion: whenever the Cross-SDK Consistency Reviewer posts a comment, it should also delete any other comments it previously posted on the same PR. This won't lose any info because we only ever care about the most recent review.