v2.1.2 - C# parses on a fresh install

One fix, found by doing the thing the release notes claimed and watching it not happen.

Fixed

• C# is parsed with Tree-sitter on a fresh install, not only in this repository.
  2.1.0 wired the C# Tree-sitter parser and measured it: 137 classes where regex found 81,
  0% flagged. That held in development and nowhere else. The grammar was declared as
  tree-sitter-c-sharp@^0.23.1; the lockfile resolved it to 0.23.1, but a user never
  receives the lockfile, and ^0.23.1 resolves to 0.23.5 (published 2026-04-14), which is
  ESM-only and requires tree-sitter ^0.25 while everything else here runs on 0.21. It
  cannot even be loaded from the CommonJS build, so the parser fell back to regex with a
  warning nobody reads — and with it came back the bug 2.1.0 had just fixed: every C#
  symbol recorded at line 1, and interfaces missing from the type list.

  Reproduced by installing 2.1.1 from the registry into an empty directory and running
  the shipped parser on one file: usingAst: false, symbolLines: {}. With the pin,
  same install, same file: usingAst: true, Foo: 1, Foo.Bar: 1, IBaz: 1.

  All five grammars are now pinned to the exact versions development is verified
  against. A grammar is a native addon compiled for one runtime ABI; a caret range on one
  is a promise that a stranger's future release will match the runtime you ship, and
  0.23.5 is what that promise is worth.