feat: model argument names as syntax nodes

[Seddryck]

Summary

• introduce dedicated public, private, and quoted argument-name grammar nodes
• add ArgumentNameSyntax with semantic value, visibility, quoting style, exact text, and span
• make named arguments expose [Name, Value] as their typed children
• share argument-name and record-field-name lexical definitions

Impact

Named argument labels are no longer represented as function identifiers. Private names such as __NONAME_0 and quoted names retain their authored spelling and metadata, leaving the syntax model extensible for future name forms.

Validation

• npm run generate
• focused Tree-sitter corpus tests for named, mixed, private, and quoted argument names: passed
• full Tree-sitter corpus: all affected cases pass; eight existing Windows CRLF snapshot differences remain
• dotnet test bindings/csharp/Expressif.Syntax.Tests/Expressif.Syntax.Tests.csproj --no-restore --nologo -m:1: 158/158 passed on .NET 8, .NET 9, and .NET 10

Close #95

[coderabbitai]

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