Teaches an agent to review and land another account's pull: read versions and comments, check out the exact head into a worktree, diff it (and interdiff later versions), approve or read CI, write one review comment, then dry-run the merge against the reviewed head before landing it. Tangled has no approve state and no line comments, so the review is a comment and the merge is the landing.
It earns a topic because pr merge lands the newest version at run time with nothing pinning the reviewed head, the dry run checks conflicts but not permission, a reviewer who fixes the code must open a separate pull, and the knot's rebase leaves a review branch that git branch -d refuses.
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