[plan] Simplify and improve Compliance UI clarity

_Automatically composed from the parent epic at dispatch time._

Split by surface along the Architect's C1–C5: 5 children (10063–10067) in 2 phases. Phase 1: API + repo page. Phase 2: tabs shell / Repos / rule editor, each depending on C1. AC16 tightened with screenshot quality bar; merge-order-safe interim steps added per critic.