Fix the hotbar client test transport body construction so the suite parses and runs again, and normalize AAA marker ordering in the flagged C# tests to restore readability consistency with the test template.
Audit all test files and bring them in line with formatting/style expectations by adding explicit AAA markers across server test methods and fixing GDScript test lint/format issues.
Expanded 45×45 district made the 18 m MaxHorizontalStep too restrictive
(floor diagonal ~63 m). Add HorizontalStepEnabled to MovementValidationOptions
(default false, matching DistrictBoundsEnabled pattern) so the check is
skipped unless explicitly opted in. Add test for disabled case (9 pass).
Update README and plan with the decision.