Why: establish the authorized task workspace and its initial baseline.
Evidence: preserved precheck receipt in .task/feature-fast-slow-o2-p1.md; R0=873e957306a791eaa36e5251b45e3ed44a863143.
Impact: task metadata only; the feature workspace starts at 873e957306.
Refs: .task/feature-fast-slow-o2-p1.md