Why: establish the authorized task workspace and its initial baseline.
Evidence: preserved precheck receipt in .task/feature-rdm-u4-closeout.md; R0=c0e123b35eeb61ee45d268a7c597b7e844f0d222.
Impact: task metadata only; the feature workspace starts at c0e123b35e.
Refs: .task/feature-rdm-u4-closeout.md