Fix 1: replace 3 copy-paste meter blocks in VitalsTree_MetersHaveExpectedSliceIds
with a single table-driven loop — a 4th meter is now a one-liner and failures
name the failing meter id directly.
Fix 2: FixtureLoader now reads the fixture as bytes and strips the UTF-8 BOM
(EF BB BF) before passing the span to JsonSerializer, so a BOM-bearing fixture
file never causes a spurious JsonReaderException.
Fix 3: add [Trait("Category", "Conformance")] at the class level so conformance
tests are selectable by category filter.
Fix 4: add missing <param name="layoutId"> doc tag to LayoutImporter.ImportInfos.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2b653b8fc0