Why: establish the authorized task workspace and its initial baseline.
Evidence: preserved precheck receipt in .task/feature-rdm-two-trees-followup-w3-rest.md; R0=2b7fdc39a1f44163f4766701429d61ffd6926f1a.
Impact: task metadata only; the feature workspace starts at 9e6d9690f6.
Refs: .task/feature-rdm-two-trees-followup-w3-rest.md