dx-shepherd/rega: both production composites should get hints, but 37/27 showed
only regions-mfe was reclassified. research-map-plus-grid was still bare: it
composes doxa-research-map (74 engine refs) but its OWN bundle has 0, so keying
on the own-bundle signal alone missed it.
builtBundleLoadsEngine now also scans the bundles a leaf `composes`, resolving a
composes entry that names its child by element TAG (stack-demo composes
"research-dashboard-map", bundle "research-dashboard") through an
element→bundle map built from the scanned bundles. So a composite is hinted
when its own bundle OR any composed child's bundle loads an engine; big-picture
(composes only non-maps) stays out.
Result: both production composites hinted (regions-mfe via own bundle,
research-map-plus-grid via its child), and stack-demo too (it composes a map).
check:leaf-hints mirrors the same tag→bundle resolution from the manifest, so
gate and generator can't drift: PASS 41 hinted / 23 bare. Poison-tested the
composes-child case (stripped → fails) and the pure-non-map case (big-picture
given a hint → fails). Also carries the comment reword from the token-ladder
correction across every hinted leaf.
rega's A9NET run found two production composite tabs — regions-dashboard/
regions-mfe and research-map-plus-grid — getting NO hints, because my first
cut gated on the leaf's isMap flag and both are isMap:false composites that
mount a map child and load the engine at runtime. Same trap the
check:leaf-engine-per-provider isMap gate fell into.
The gate now keys on whether the leaf's OWN page loads a map engine: a real
map leaf (isMap), OR a cap-4 nested-elements-mfe composite whose BUILT bundle
references an engine (builtBundleLoadsEngine). It excludes a cap-5
nested-mfe-spa shell (maps are iframe children), a genuinely map-less
composite (big-picture, stack-demo: 0 engine refs), and a plain non-map leaf
sharing a bundle with a map (connectivity-list). regions-mfe (33 engine refs)
is now hinted; research-map-plus-grid is not — its own bundle has 0 refs, the
engine loads in a lazily-fetched child (recorded gap; the deeper cause is the
upstream isMap classifier mislabelling these composites, which composes-by-tag
where the child .vue filename differs).
check:leaf-hints rebuilt to the same rule, read from the manifest (profile
type + isMap) and the built bundle, so gate and generator cannot drift. PASS
37 hinted / 27 bare; both new poisons bite (composite stripped of hints;
non-map leaf in a map bundle given a hint).
A cold map ran serially: leaf HTML, then the bundle (250-470 KiB gz, parsed),
then only the engine (from cdn.jsdelivr.net or api.mapbox.com), then the style
host, tiles, and data. Four origins discovered one after another, none
pre-connected. That waterfall is the shape behind A9's 3-5 s cold map.
generate-tree now emits, in each MAP leaf's <head>, a preconnect for the
engine origin, the style host and the data origin, and -- only on the 'auto'
leaf, which carries no engine <script> today -- a preload of the engine, so
DNS/TLS and the engine download start alongside the bundle instead of after
it. A non-map leaf (grid/card/chart-table/app-shell/composite) gets nothing.
The engine is decided at build time from the SAME inputs the runtime ladder
reads (profile-config.provider, then a baked token or a token endpoint; 'auto'
with no token path is MapLibre keyless), so the hint and the ladder cannot
disagree. Every URL, integrity and crossorigin comes from
library/constants/cdn.js, so a preload cannot drift from ensureEngineScript's
tag. The one case a static hint cannot foresee -- an explicit ?provider= or
window.MAP_PROVIDER overriding the build default at runtime -- costs one unused
preconnect.
New gate check:leaf-hints (gates:post): a map leaf without hints fails, a
non-map leaf carrying a map-engine hint fails, and a hint origin must be one
the code uses. PASS: 36 map leaves carry hints, 28 non-map leaves carry none.
Poison-tested both sides.
Unlanded (dx-base/a9-leaf-hints); the bundled-vs-shared-vs-today trade-off
report and any landing wait on rega's timing and regions' tiles.
