v0.50.0

What's Changed

• Prototype: flat Layer-0 line classifier for line-length vs gomarklint by @jeduden in #626
• Lazy parse: Layer 0 block scanner and parse-skip gate (plan 2606141902) by @jeduden in #628
• Lazy parse: BlockSpan seam for block NodeCheckers (plan 2606141903) by @jeduden in #630
• Lazy parse: Layer 1 inline index (code spans + full inline rules) by @jeduden in #632
• plan 2606141904: combine inline index (#632) and link-ref scanner (#634), update status by @jeduden in #635
• perf: five hot-path optimizations from high-performance-go.md audit by @jeduden in #633
• audit(arch): 2026-06-16 lazy-parse audit + plan 2606162214 (missing helper tests) by @jeduden in #638
• build(deps): bump golang.org/x/mod from 0.34.0 to 0.37.0 by @dependabot[bot] in #640
• docs(arch): document internal/checker and internal/rulelayer; remove engine shim by @jeduden in #639
• perf: cut Fix() allocations and fix O(n²) gitignore ancestor walk by @jeduden in #637

Full Changelog: v0.49.0...v0.50.0