Why: establish the authorized task workspace and its initial baseline.
Evidence: preserved precheck receipt in .task/feature-generative-ui-u2.md; R0=95992d751f0a6ea8e345109dbb6b9367d9055e92.
Impact: task metadata only; the feature workspace starts at 95992d751f.
Refs: .task/feature-generative-ui-u2.md