feat(csharp): add C# language template filters - #218
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Add a filtercs package providing C# code-generation filters and register them in the shared template FuncMap. Functions: csReturn/csType, csDefault, csParam(s), csVar(s), csTestValue, csAsyncReturn (Task<T>), csNs/csNsOpen/csNsClose (block namespaces), and csExtern(s) reading cs.namespace/name/default/using/package/version meta. Type mapping: scalars to C# primitives, arrays to List<T>, interfaces are I-prefixed, async returns wrap in Task<T>, and namespaces are block-scoped. Extern test fixtures gain additive cs.* meta keys. The filters are unit-tested in isolation against the shared testdata fixtures.
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Summary
Adds a
filtercspackage providing C# code-generation template filters, registered into the shared templateFuncMap(pkg/gen/filters/funcmap.go) alongside the other supported languages.The filters are pure model→string functions and are independent of any SDK template; a template opts in by calling
{{ csReturn . }}and friends.Filters
csReturn/csTypecsDefaultcsParam/csParamsType name, comma-joinedcsVar/csVarscsTestValuecsAsyncReturnTask<T>(Taskfor void)csNs/csNsOpen/csNsClosecsExtern/csExternscs.namespace/cs.name/cs.default/cs.using/cs.package/cs.versionmetaType mapping
int,long,float,double,bool,string);bytes→byte[];any→objectList<T>I-prefixedTask<T>Testing
Every filter is unit-tested in isolation against the shared
pkg/gen/filters/testdatafixtures. The extern fixtures gain additivecs.*meta keys; other languages read only their own keys, so this is non-breaking.go test ./...— all greengofmt/go vet/staticcheck— clean