diff --git a/internal/check-leaf-hints.mjs b/internal/check-leaf-hints.mjs
new file mode 100644
index 000000000..8a9085e51
--- /dev/null
+++ b/internal/check-leaf-hints.mjs
@@ -0,0 +1,89 @@
+#!/usr/bin/env node
+// check-leaf-hints — a map leaf gives the browser its origins early; a non-map leaf carries no map hint.
+//
+// ★ WHY. A first visit to a map leaf ran serially: leaf HTML → the bundle (250–470 KiB gz, parsed) →
+// only THEN the engine (from cdn.jsdelivr.net or api.mapbox.com) → the style host → tiles → data. Four
+// origins, discovered one after another, none pre-connected — the shape behind A9's 3–5 s cold map
+// (_qa-cycle/03-deployment-cycle/A9-MAP-LOAD-STATIC.md). generate-tree now emits, per MAP leaf, a
+// preconnect for the engine + style + data origins and (on the 'auto' leaf, which carries no engine
+//
research-map · doxa-research-map
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diff --git a/public/dx-maps/doxa-simple-map/doxa-simple-map/adoption/index.html b/public/dx-maps/doxa-simple-map/doxa-simple-map/adoption/index.html
index c6bdb0180..394daab73 100644
--- a/public/dx-maps/doxa-simple-map/doxa-simple-map/adoption/index.html
+++ b/public/dx-maps/doxa-simple-map/doxa-simple-map/adoption/index.html
@@ -11,6 +11,11 @@
Adoption Map · doxa-simple-map
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