fourmolu-checker v1.5.1

• add a cross-platform real Extension Host diagnostic oracle that compares
  Fourmolu Checker's diagnostics and selected-block Quick Fixes with explicit,
  test-only logical blocks derived from live Fourmolu output;
• detect missing, unexpected and duplicate diagnostic ranges, message or
  severity mismatches, and report bounded failure details as CI artifacts;
• preserve Fourmolu's exact LF/CRLF choice when a whole-document Quick Fix or
  explicit full-file formatting edit is applied;
• cover every live Fourmolu 0.20.0.0 formatting message with a manifest,
  while retaining finalNewlineRemoved as a documented unit-only case.