feat: support spread syntax in compound literals

[Seddryck]

Summary

• model array elements explicitly and preserve array spread markers
• preserve spread semantics on named record fields
• reject spread markers without a following expression

Validation

• npm run generate
• npx tree-sitter test (all feature cases pass; 8 pre-existing Windows/CLI recovery snapshot differences remain)
• 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 #81
Close #82

[coderabbitai]

Important

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Run ID: a6a27321-70d2-419c-a3d9-619118dc9603

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