Group @testable imports at the bottom, per public/rules-swift's swiftformat. A
behavior-preserving import-ordering reformat across 252 files (mostly tests).
--trailingclosures was deliberately not adopted (cosmetic, and swiftformat flags
it as caution-worthy).
Reject top level declarations that omit a name attribute. Disallow derivation by restriction of xs:anySimpleType inside simpleType definitions. Require restriction facets length, minLength, maxLength, totalDigits, and fractionDigits to restrict or equal the base type facets. Updates the conformance baseline to 383 accepted invalid schemas.
