Why: The U1 controlled trial finished; its fixtures, validator, runner,
per-run results, report, and renderer spike must be reviewable from the
task branch, and the task card needs the final PASS/FAIL record.
Evidence: results/summary.json + report.md (SELF, MiniMax official
channel, CNY 3 of 200 cap); make evidence receipts for precheck,
task-sync, and make test follow in this branch.
Impact: Task-scoped experiment artifacts only (.task/genui-u1/); no
production code changes.
Refs: Documents PR #62 (proposal r2); task card feature/generative-ui-u1
