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).
Add a cross-cutting conformance suite validating realistic schemas against
conforming and non-conforming instances: a patterned, bounded, ID-keyed XSD
purchase order and a RELAX NG contact card using interleave, attribute value
choices, and optional/repeatable elements, plus datatype boundary fixtures.
Collapse the completed Validation roadmap block into the shipped summary.
Closes#13Closes#2
