New lib/src/editor/editorconfig.dart: a dependency-free INI parser, an
EditorConfig-flavour glob matcher (*, **, ?, [seq], {a,b}, {m..n}), and
directory-walk resolution honouring root=true with nearest-file / last-section
precedence. EditorRegistry resolves the config when a buffer opens (exposed on
the buffer JSON for the UI) and applies end_of_line / trim_trailing_whitespace /
insert_final_newline on save, reconciling the in-memory buffer when the text
changes. 100% line coverage on the new file.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8
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