v6.3.0 Mobile UX Polish Evidence Packet

Static reviewer-facing evidence for mobile header drawer, homepage above-the-fold, CTA touch target, and route-card spacing polish.

• Checked widths: 390px, 430px, 768px, 1024px, desktop.
• CTA targets: Start Here, Ecosystem, Static AI Interpretation, Reviewer Evidence, Route Index, Low-Capability Agent Guidance.
• Boundary: no runtime AI behavior, no endpoint execution, no writable GET actions, and no state mutation through query-string URLs.