Why: establish the authorized task workspace and its initial baseline.
Evidence: preserved precheck receipt in .task/feature-rdm-two-trees-followup.md; R0=46e331a7a81c94c6f5881c997ae0aca45664c830.
Impact: task metadata only; the feature workspace starts at 46e331a7a8.
Refs: .task/feature-rdm-two-trees-followup.md