feat: distinguish current object from spread syntax

[Seddryck]

Summary

• introduce @_ as the explicit current-object expression
• treat bare ... in arrays and named record fields as an implicit spread of the current object
• distinguish implicit spreads from explicit ...@_, ...@Args, and ...args operands in the lossless typed syntax tree
• document current-object, variable, function-result, and spread semantics

Validation

pm run generate

px tree-sitter test (all feature cases pass; Windows-only recovery and CRLF snapshots differ locally and pass in Ubuntu CI)

• dotnet test bindings/csharp/Expressif.Syntax.Tests/Expressif.Syntax.Tests.csproj --framework net8.0 --no-restore --nologo --disable-build-servers --maxcpucount:1
• dotnet test bindings/csharp/Expressif.Syntax.Tests/Expressif.Syntax.Tests.csproj --framework net9.0 --no-restore --nologo --disable-build-servers --maxcpucount:1
• dotnet test bindings/csharp/Expressif.Syntax.Tests/Expressif.Syntax.Tests.csproj --framework net10.0 --no-restore --nologo --disable-build-servers --maxcpucount:1

Close #100

[coderabbitai]

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