Trigger: timetable-stabilization sprint (PR #18, #19) surfaced three
diagnostic incidents that the RFC v1.0 sequencing did not anticipate.
Adds TEST-INFRA-001 as prerequisite sprint before F2 (Playwright +
visual regression infrastructure, baselines against prototype HTML).
Extends F5 with dual-tier visual regression scope. Adds R-11 to risk
register, DoD-16 through DoD-20 to Definition of Done.
No changes to F2-F6 internal architecture, Aura preset, FormField API,
Tailwind v4, or bundle size targets.
Effort impact: +5-7 working days. Total now 15-19 days.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
