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.
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