task_20260212

Force Regex to use GeneratedRegex Source Generator attribute instead of runtime Regex construction for compile-time optimization.

Force all DTO (Data Transfer Object) types to be declared as record instead of class for immutability and value-based equality.

Force record instantiation via positional constructor with named arguments instead of property initializer syntax for stronger immutability expression.

Enforce branch-based workflow with meaningful Korean commits and PR creation for traceable decision history.

Force JsonSerializerOptions to be declared as static readonly or readonly fields instead of creating new instances inside methods.

Centralize external namespace imports (BCL, FCL, NuGet) in a GlobalUsings.cs file per project, keeping individual files clean.