Gate 2.2. Mounts into Lane A's editor through the published seams only —
panel at reserved order 50, every gizmo parented to EDITOR.overlay, venturi
drag through registerTool, site.wind mutated then markDirty(). No second wind
validator (validateSiteWind is already inside A's validateSite) and no private
harness: windForSite() is the only wind this file builds.
Gizmos are drawn from wind.core.venturi/shelters — what the wind actually
flies — not from the site JSON, so a mis-wired setVenturi shows up as a funnel
that vanishes rather than a number nobody reads.
