Field Test

Hands-on, adversarial test pass of $ARGUMENTS (the feature/command named when this skill was invoked, e.g. atmos vendor pull).

If no target was given, default to the change introduced on the current branch rather than asking. Resolve the actual pull-request base branch when one is available (gh pr view --json baseRefName -q .baseRefName for the current branch), falling back to the repository's default branch (gh repo view --json defaultBranchRef -q .defaultBranchRef.name) when no PR exists yet. Do NOT use the upstream tracking branch (@{u}) as the base — for a normal feature branch that tracks origin/<same-branch-name>, diffing against its own upstream produces an empty or near-empty diff, not the PR's actual changes, once the branch has been pushed.