X_PR_NOT_FOUND
Means
no pull request for this checkout
Typical cause
x pr with no --pr, on a branch GitHub has no PR for
Fix
x pr review --pr <n> --json, or open one first: gh pr create
no pull request for this checkout
x pr with no --pr, on a branch GitHub has no PR for
x pr review --pr <n> --json, or open one first: gh pr create