All three source checkpoints are from the Constitutional Midtraining paper (arXiv:2607.26654, geodesic-research). This model tests whether the constitutional-midtraining weight delta (taken post-midtraining, replay cancelled via the control anchor) installs the same alignment behaviour when added to the control after its 200K SFT — i.e., whether the effect is portable content rather than midtraining placement. Built shard-wise in fp32, cast back to bf16; exact source revisions and delta norms in task_vector_report.json.