Convert the seven structure-pass compile checkers to located findings so
each error attaches to its own declaring node instead of the schema root
(#169): a facet inapplicable to a list/union variety, a restriction of
xs:anySimpleType and a constraining facet on anySimpleType-based simple
content, a top-level definition missing its name or carrying a local-only
attribute, a nested named definition, an empty targetNamespace or import
namespace, and an all-group reference with an illegal minOccurs/maxOccurs.
The rewire in structureFindings preserves the prior finding order and
count; each error predicate and reason string is unchanged, only the
location each finding carries differs. Adds a located-diagnostics test
per checker family in a new suite kept within the type-body budget.
A simpleType nested inside a restriction/list/union/element/attribute is the
anonymous localSimpleType (no name), and a nested attributeGroup is always a
reference; named simpleType and attributeGroup definitions are top-level only (a
direct child of schema or redefine). A nested definition declaring a name was
accepted; it is now rejected. A nested anonymous simpleType, an attributeGroup
reference, and a top-level named definition are unaffected.
XSTS: invalid schemas accepted 403 to 394, no other bucket raised.
