[VegetarianOrc]

Summary

• Propagate experimental XML remarks to nested variant case records, including generic notification result cases.
• Omit the unused Temporalio.Converters import from model files while retaining it in service files that use ISerializationContext.
• Add regression coverage, regenerate .NET samples, and update the authoring guide and changelog.

Fixes #283
Fixes #284

Validation

• Full cargo validate passed: Rust, Python, TypeScript, Go, Java, .NET, Markdown, and cross-language JSON Schema conformance.

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