v0.5.7

Added

• masterror::error::template module providing a parsed representation of
  #[error("...")] strings and a formatter hook for future custom derives.
• Internal masterror-derive crate powering the native masterror::Error
  derive macro.
• Template placeholders now accept the same formatter traits as thiserror
  (:?, :x, :X, :p, :b, :o, :e, :E) so existing derives keep
  compiling when hexadecimal, binary, pointer or exponential formatting is
  requested.

Changed

• masterror::Error now uses the in-tree derive, removing the dependency on
  thiserror while keeping the same runtime behaviour and diagnostics.

Documentation

• Documented formatter trait usage across README.md, README.ru.md and the
  masterror::error module, noting compatibility with thiserror v2 and
  demonstrating programmatic TemplateFormatter inspection.