Why: establish the authorized task workspace and its initial baseline.
Evidence: preserved precheck receipt in .task/feature-rdm-two-trees-followup-d-w11-w12.md; R0=33d6ef69212595c680a744549986c19bb6acd6c3.
Impact: task metadata only; the feature workspace starts at e8de6ba97b.
Refs: .task/feature-rdm-two-trees-followup-d-w11-w12.md