Flower Mesh opens on an SVG lens: the leaf-engine gate stops expecting a canvas there

upg-neighbor/flower-mesh is a preset of the upg-neighbor element that opens on
its Flower Mesh lens, which is SVG and has no GL map. The leaf is still a map
element: the view-switcher reaches Send Map and the other GL lenses, so it must
keep isMap (engine peer, token ladder). Marking it isMap:false would break those
lenses. check:leaf-engine-per-provider judged it as a drawing map and failed it
on both engines ("drew: none"), before and after the auto engine alike.

- upg-neighbor.instances.json: the flower-mesh preset says "opensOnMap": false.
- generate-tree.mjs: an instance's manifest entry carries opensOnMap:false when
  it is set (absent otherwise, so every other entry is byte-identical).
- check-leaf-engine-per-provider.mjs: such a leaf is not judged as a drawing
  map. Its Mapbox-request count under ?provider=maplibre is still measured.

Headless: after bun run tree, the manifest marks only
upg-neighbor/upg-neighbor/flower-mesh with opensOnMap:false. The gate's leaf
selection, replayed over it, judges 28 of 56 leaves as drawing maps, with
flower-mesh excluded and its five siblings unchanged. No browser run.

internal/check-leaf-engine-per-provider.mjs

@@ -52,9 +52,11 @@ const manifest = JSON.parse(readFileSync(manifestPath, 'utf8'))
 const leaves = []
 for (const b of manifest.bundles || []) for (const p of b.profiles || []) {
   const base = `${b.bundle}/${p.profile}`
-  const add = (id) => { if ((!ONLY || ONLY.has(id)) && existsSync(join(DIR, TREE_NAME, id, 'index.html'))) leaves.push({ id, isMap: !!p.isMap }) }
+  // opensOnMap:false (a preset opening on a non-GL lens, e.g. upg-neighbor/flower-mesh): not judged as
+  // a drawing map, but its Mapbox-request count under ?provider=maplibre is still measured.
+  const add = (id, opensOnMap = true) => { if ((!ONLY || ONLY.has(id)) && existsSync(join(DIR, TREE_NAME, id, 'index.html'))) leaves.push({ id, isMap: !!p.isMap && opensOnMap }) }
   add(base)
-  for (const inst of p.instances || []) add(`${base}/${inst.id}`)
+  for (const inst of p.instances || []) add(`${base}/${inst.id}`, inst.opensOnMap !== false)
 }
 if (!leaves.length) { console.log('LEAF-ENGINE: NOT MEASURED — no leaves matched'); process.exit(75) }
 

internal/generate-tree.mjs

@@ -1138,6 +1138,10 @@ function readInstances(dir, profileName, bundle, tag) {
         element: tag,
         iframeUrl,
         embed: { iframe: iframeEmbed },
+        // A preset that OPENS on a lens with no GL map (upg-neighbor's flower-mesh is SVG) is still a
+        // map element: its view-switcher reaches the map lenses, so it keeps isMap (engine, token
+        // ladder). This tells the draw gates not to expect a canvas on first paint. Absent = true.
+        ...(i.opensOnMap === false ? { opensOnMap: false } : {}),
       }
     })
 }

plugin-designs/upg-neighbor/upg-neighbor.instances.json

@@ -33,6 +33,7 @@
     {
       "id": "flower-mesh",
       "title": "Flower Mesh",
+      "opensOnMap": false,
       "props": {
         "view": "flower-mesh"
       }